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4 years ago#1
Guest
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how many fish should be in a 20 gallon aquarium?

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4 years ago#2
johnarthur
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It depends on the fish species. For example, a torpedo shaped fish like a neon or a Guppy is slender and doesn't make very much mess. Probably ten such fish would do fine in a 20 gallon aquarium. An angelfish is not very long but is very large. Two of them would be a crowd in a 20 gallon tank.

When selecting fish for an aquarium, you need to consider adult size and behavior, environmental requirements and compatibility issues. No single aquarium can provide ideal conditions for all aquarium fish. In addition, a single species aquarium that is not over crowded is much easier to maintain than a multi species tank.

If you're new to the hobby, you may want to do some research about the nitrogen cycle. The SEARCH button at the top of the page will get you there. And we'll be happy to answer your questions.

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4 years ago#3
Fry Daddy
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www.AqAdvisor.com is a good reference where you can enter your tank size and filter info and then select the number and types of fish you wish to keep. It will tell you how you are doing as far as filter and tank capacity and warn you of most incompatibility issues.
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4 years ago#4
ChaosReborn
Champion
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Interesting site Fry Daddy. However it tells me that my leptosoma which gets a max length of 4.5 inches is too big for my 55 gal lol

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4 years ago#5
achintya
Wiz
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many a times we do refer to this site.it is indeed a very informative and perfect site for beginners.

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4 years ago#6
pettygil
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I went to www.AqAdvisor.com and added my tank and I entered 5 Glo fish and 5 Mickey Mouse Platies..

I have a Walmart 10 gallon fish tank
Product in Inches (L x W x H): 20.0 x 11.0 x 12.0

It says:
# Suggestion: If you want to keep more than 1 Platy, minimum recommend male to female ratio is 1:2 (M:F). You will be less likely to experience problem if you get even more females.

Recommended temperature range: 18 - 24 C. [Display in Farenheit]
Recommended pH range: 6 - 7.8.
Recommended hardness range: 5 - 15 dH.

Recommended water change schedule: 42% per week.
Your aquarium stocking level is 124%. [Generate Image]Help on Generate Image

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4 years ago#7
KristinAnn
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It is a great site, but should be supplimented with research, too.

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4 years ago#8
johnarthur
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It's always better to under stock than to over stock. That gives you a safety margin in biological loading and will help avoid problems. Not all of the compatibility and loading charts you see consider adult sizes or behaviors. This is especially true of those in pet shops.

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2 years ago#9
adamsmith
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It depends on the fish.

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2 years ago#10
lynnmarie0123
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i have a 20 gall and i have two small-medium sized goldfish. it seems too crowded. they are about 3 inches in length. i also have a largish rock they can hide under taking up alot of room. i dont fill mine up to the top with water either & then thru evaporation, water level will go down. i want to get a bigger tank but they are so darn expensive, i have a very small house and dont have anything sturdy enough to place a larger tank on. Seems i am gathering a collection of tanks: a 1.5, a five, now a twenty gallon! want to get some bettas but not till i have mastered how to raise goldies c:

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2 years ago#11
achintya
Wiz
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you cn also keep blackwater amazonia or low tech planted tank...

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2 years ago#12
J Smooth
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Thanks. That helps alot and makes it easier to shop for this hobby.

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2 years ago#13
comeback
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Great site - thanks for the reference

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2 years ago#14
vadynsmommy
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Thank you so very much for the Hyper-link! It was a HUGE help in figuring out whether or not I was overstocked on my tank. Now, originally just going by the all adult sizes, I was about 180% (overstocked) but when I chose to add them in as juvenile sizes and put in their "actual" sizes at this time... I was pleasantly surprised to only be at 61% capacity with 2 dwarf frogs and 1 Common Pleco. YAY Me!!! We are planning to find a better, more suited, forever home for the Pleco and the frogs are going into their own seperate home so that we can add the salt to our main "home" to get rid of Ick and some other sick fish issues. (Our 3 yr old son and 3 yr old grandson cried at the idea of finding the froggies new homes.) We do have all of the fish that we can "see" Ick on, separated into their own 13 gal trash can "home" for now. The others are in the main tank unless / until they show any signs of Ick or fungus. I believe that we are going to lose both of our Dalmation Mollies as one has pop-eye as well as Anchor Worms (?)we believe, and the other has Anchor worms and is lieing upright at the bottom of the tank, not moving. She is breathing a bit and her gills are moving but not normal. If you have any suggestions for any of my issues.. Please feel free to write a book!!! LOL Thank all of you so very much for all of your help. I feel truly BLESSED to have stumbled upon this site and I am a "for life-er"!!! LOL Dawn

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2 years ago#15
vadynsmommy
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Ohh... and PS. We have 15 new fry... 10 from one mum and 5 from another. (Both the Dalmation Mollies I believe.) They have been in a large, soft net since we first found them. The first set was born 1 week ago today and the 2nd set was born today. I am so saddened by the thought of losing their momma's. I am very concerned about their health as well.... since the Ick came into the tank about a week ago. (That we know of, on 8 new fish that we brought home from a pet shop.)

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2 years ago#16
johnarthur
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The ich parasite infests fish with weakened immune systems, and fish immune systems usually get compromised by toxic nitrogen compounds. Please make sure ammonia and nitrite are zero and nitrate is below 40 ppm. If they are not, a 20 or 25 percent water change every other day will usually fix the problem so long as you feed no more than the fish actually eat in a couple of minutes.

Since the ich parasite deposits its eggs in the substrate, the entire aquarium is infested. One way to get rid of ich is to gradually raise the temperature to about 86 degrees Fahrenheit and add some aquarium salt. Other types of medication are available, and the treatment period usually lasts for about two weeks. This gives the eggs a chance to hatch so the little baby ichs can get zapped.

Warm water has less oxygen than cold water, so you may want to add a bubbler during the treatment period. The partial water changes every other day mean the salt or other meds will need to be partially replaced. Once the toxic nitrogen compounds are controlled, weekly partial water changes should be enough.

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2 years ago#17
aqua man
Guest

I am getting a 20 gallon aquarium, this is what I want to put in it. Too much?

10 neon tetra
2 dwarf gourami
5 ghost shrimp
1 black molley
1 electric blue cichlid
1 swordtail
1 snail
1 gold claw crab
1 red tailed shark

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2 years ago#18
amneris3
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Aqua man~

That is too many fish for a 20g.

Redtail sharks should be in a 50g tank.

cichlids like to be in groups of their own kind and aren't suitable tank mates for the other types of fish you have listed. They also require a larger tank than 20g.

A group of 5 black mollies would work in a 20g. They also like to be in groups of their own kind. Same for the swordtails.

I would only put one gourami in a 20g tank.

The neons would also be okay by themselves, with the shrimp and snails.

I think the crab you have listed is only partially aquatic and needs a water and land habitat.

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2 years ago#19
johnarthur
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Overcrowding is a common mistake. That and overfeeding are, in fact, the two major causes of aquarium problems. Either will produce more toxic ammonia than the nitrogen cycle can neutralise, so you may want to click this link:
http://www.myaquariumclub.com/the-nitrogen-cycle-for- beginners-358.html

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2 years ago#20
Aliyah
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I agree with amneris3, you should pass on the red tail shark, and cichlid

You could pretty easily do the 10 neons, 5 ghost shrimp (watch out they may get eaten), 1 snail, and 1 dwarf gourami. Instead of the red tail shark, I would do a smaller type of bottom dweller like corys or otos, or just more shrimp. If you passed on the bottom dwellers, you could maybe do a trio of the mollies, but watch out for aggression from the gourami as well as water quality and fry.





If you add in both 6 of the smaller bottom dwellers, as well as the 3 mollies you end up around 90-100% stocking which leaves little room for error.

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2 years ago#21
aqua man
Guest

I considered what you said, better?

1 snail
1 dwarf gourami
3 electric blue cichlids
1 upside down catfish
3 guppies
3 red wag platy
1 swordtail
3 ghost catfish


I`m not sure if it`s a good idea for the cichlids or catfish, just checking

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2 years ago#22
Aliyah
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Electric blue cichlids can grow up to 8 inches. They would be extremely cramped and territorial in your tank!

You need at least 5x glass catfish and 3x upsidedown catfish minimum. One lone upside down catfish will be lonely and shy.

I think if you choose a small group of one or the other types of catfish and kept the platies, guppies, dwarf gourami and snail, you would have a decent tank

check out aqadvisor. It is a pretty good stocking calculator, and it also warns about specific fish needs.

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2 years ago#23
aqua man
Guest

That website was great! Here`s what I`ve come up with:

3 silver hatchet
2 dwarf gourami
2 upside down catfish
1 oto
1 snail
1 black molley
2 red wag platy

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2 years ago#24
comeback
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Just some quick thoughts: Mollys are happiest in water tending towards saline, Otos should be kept in groups of 4 or more otherwise they get stressed, might want to consider a male and female honey Gourami for their calm temperament, skip the catfish as Otos will do the algae task.

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2 years ago#25
amneris3
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Aqua man~

You should choose one species of fish that you like best and build around it. For a 20g, you will need to choose a fish that stays under 4" long. Any of the livebearers, such as mollies, platies, guppies or swords will work. Keep at least 3 of the same type. Or choose fish that like to school, like tetras, danios, barbs, neons or hatchets. Keep a school of at least 6.

Since all of the fish I just mentioned primarily inhabit the mid and upper regions of a tank, you can add fish that will occupy the bottom. Cories and otos are good choices.

New fish owners often want to throw all kinds of fish in an aquarium without considering compatibility and the specific needs of each fish. Not all fish are compatible in temperament, habitat or water parameters. Generally fish that come from the same regions are compatible.

Also, when you are adding fish to your tank, make sure to add 2 or 3 fish at a time and wait at least one week before adding new fish.

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2 years ago#26
aqua man
Guest

I think the Hatchetfish are the species I`ll build on

5 neon tetra
5 black loach
1 red tailed shark
3 hatchetfish
2 dwarf gourami
1 snail

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2 years ago#27
Aliyah
Gold Member
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Like amneris3 said before, the red tail shark needs more space. It is much too aggressive to be in your tank.

I would also have at least 5 of schooling species like hatchets.

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2 years ago#28
aqua man
Fresh Member
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Is a peackock eel OK in a 20 gallon aquarium with a red tailed shark, two dwarf gourami, four snails, 3 upside down catfish, and three hatchet?

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2 years ago#29
BrittanyDianne
Gold Member
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Can 5 tiger barbs, 1 white skirt tetra, 5 rosy minnows , 4 black skirt tetras and 4 albino cories fit in a 20 gallon? It says it would be 98% stocked. Is that too much?

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2 years ago#30
problem solver
Junior Member
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they should fit but I wouldnt add them all at once for your tank will need to get used to the amount of bacteria a little bit at a time.

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