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5 years ago #1
redwings5552
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I've had my zebra danio's for a week and a half now. I still have this one danio being very much aggressive towards the other fish. Will this aggressiveness go away once I start to add other species of fish in?

Also, what other types of fish would you recommend with Danio's?

Thanks.

Posted on Tropical Fish
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5 years ago #2
achintya
Wiz
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with danio you may keep neon and cardinal tetra,cory,platy....

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5 years ago #3
redwings5552
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Thanks for the reply. What about the aggressiveness with that one Danio, do they usually get less aggressive once other fish are introduced to the aquarium?

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5 years ago #4
johnarthur
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It may help to add a few more zebras. Didn't you say the aquarium is a 37 gallon? Aggressive behavior is usually the result of hormones, and some of us already know how difficult those things can be to control.

Of course, over crowding also causes aggression, but having a large group in a large aquarium can limit bad behavior.

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5 years ago #5
redwings5552
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Hormones eh? Yeah I think I'll add a few more Danios. Are those glow in the dark fish Danios?

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5 years ago #6
johnarthur
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Yes. Somebody did some gene splicing to create the glow zebras. When you buy one you are supposed to agree to never sell their fry. Some aquarists are not altogether comfortable with the genetic engineering of fish. Still, it's bound to happen with all species.

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5 years ago #7
redwings5552
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How many more fish do you think I can add to my 37-gallon tank? I already have 6 zebra danios which are a decent size I guess. But I want to add neon's, Guppies, mollies, platys, etc...and I know most of these guys are schooling fish.

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5 years ago #8
Smilyface
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danios get along great with tetas, platys, mollies..most schooling fish. danio arent aggressive towards other fish, unless the tabk is overcrowded

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5 years ago #9
Smilyface
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Danios are great with tetras, platys, mollies...basically any schooling fish. danios arent aggressive towards other fish unless ofcourse if your tank is too crowded.

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5 years ago #10
johnarthur
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What you can get by with and what is best are frequently two different things. The water temperatures and other parameters that are ideal for Danios may be less than ideal for other species. It's usually a good idea to check out candidate species on Google. All that said, cory cats are happy in a range of conditions and will school on the bottom if you have at least six of them.

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3 years ago #11
Lynda B
Guest

Hi there,

I have been looking up info on aggressive danios, am new to this forum but but thought you may have some advice.

We had 8 Zebra danios and 8 Harlequin Rasboras in our 98 litre tank.

At first the Danios just played around, but then one got aggressive - controlling the front of the tank, nipping off part of another danios tail. It got to the point where he would not let any of his own mates or the rasboras near him. He was so aggressive we took him back to the shop.

All was fine for a few days, then another Danio started behaving the same, and terrorised all the inmates. We decided to take him back....Blow me down if another one didn't step up and begin bullying.

We decided to relocate the danios into another tank,
after a day the bully boy is at it again, driving the others behind the filter.

My other half really likes danios, but I dont think we should keep any of them - they seem too aggressive.

I would prefer a couple of feature fish to put with the Harlequins ( they are nice peaceful shoaling critters) and wondered if you have any suggestions.

Thanks.

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3 years ago #12
dawnrader
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I'm no use to you either, i have 5 danios in my 100l tank and one of them is driving me and the tank mates mad.
I know i could get more to settle it down however i'm seriously considering taking all of them back to the shop.

It's a pity i like watching them chase each other round in fun, just one of them has other ideas and is bullying a gourami 3 times it's size

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3 years ago #13
johnarthur
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Zebra danios have a reputation for being fin nippers. Usually the aggression is moderated if they are in large groups, but they are still bullies.

When populating an aquarium, compatibility issues are very important. Here are some more things to consider:
http://www.myaquariumclub.com/compatibility-214.html

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3 years ago #14
Lynda B
Guest

Thank you for your replies. As bully boy was still at it after we removed them from the main tank, we decided to put 3 of the more timid danios back in the big tank. Leaving the short fin bully with 2 long finned ones in the 'Sin Bin' tank.

So far so good, the 3 put back with the Rasboras have not started acting up yet, and the short fin bully, has quietened down and does not seem to be having a go at the long fins yet.

Maybe, they are just getting used to another new situation and previous behaviour will be repeated, but for now all is peaceful.

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3 years ago #15
Sandy4
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I have 8 zebras and they are all kind of crazy. They dash around like mad but don't nip too much. I have 6 neons that hide from them but I don't know what to do. Maybe they feel crowded, there are 20 fish in the 30 gallon tank...I think they are all pretty small. The zebras do peck at the pleco.

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3 years ago #16
redwings5552
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Well, Sandy4 how long have you had this aquarium for? Sometimes it takes some time for fish to adapt to their new environment. Zebra's tend to be nippy towards their own kind and others. What other fish do you have in that aquarium besides the 8 zebras, the 6 neons, and your pleco?

I used to have a 30 gallon with zebras and neons...it did take them a good month to settle down. If you are worried about the Zebras being overly aggressive, I'd say maybe put them in a different aquarium or try and give them to a friend.

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3 years ago #17
Nightstar99
Guest

The LFS we bought our first 17 litre tank from told us one platy and one zebra danio would be good tank mates.

The danio nearly killed the platy which eventually ended up totally inert at the bottom of the tank while the danio repeated attacked it.

I put the danio back in its bag and took it back to the LFS, who insisted that I should get another 4 danios and another 3 platys to go in this little tank.

I didnt listen to them and just gave them back to the danio.

I know the configuration couldnt have been more wrong for a danio but its really put me off them and I cant imagine buying any more even if I had a big enough tank.

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2 years ago #18
minnow and danio
Junior Member
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my zebra danio was agressive and nipped and chased the other fish constantly however it stopped after about 2 weeks, i think it was just stressed from being moved from 1 tank to another.
i have zebra danios and white cloud mountain minnows and their super happy.
if youre looking for some colour or super adorable fish, check out glofish their awesome

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2 years ago #19
Nightstar99
Gold Member
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I actually didn't know what Glofish were. I've just googled them and apparently their sale and import is banned in the EU, so no glofish for me.

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2 years ago #20
johnny10
Platinum Member
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My Danio liked to bully all his tank mates except for the bigger female guppy. I have an otocinclus who gut irritated from the attacks as well and fought back. Now there is peace amongst that tank!

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1 year ago #21
Cat-Fish
Guest

Well I've got 4 zebras, 6 neons & 5 cardinals, 10 rasboras (mix or hengel and Harlequins), 4 julii corydoras & 4 platies. THey all get along great and I've had no issues. Even the rasboras and tetras who are schooling don't school so tightly and swin around with the other fish. I think it has to do with the individual fish and their environment. My tank has a lot of plants and hiding places so if any fish want a time out there's always someplace to get it.

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1 year ago #22
Andy
Guest

I am having a similar aggression problem with one Zebra Danio. I have 3 total, plus one Tetra -- tank is just starting out so we couldn't add more fish (12 gal Fluval Edge tank that my 10-year old got for Christmas). The Danio is going nuts now, after about 1 week of normal behavior. It's chasing the other Danio's constantly and sometimes going after the Tetra.

Not sure if I should let this play out or remove the fish - my daughter would be distraught if I told her we had to give the fish back to the store...

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1 year ago #23
Joni
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Please understand what I am fixing to say in no way means you should have known this. If the pet store doesn't help educate you what are you supposed to think right? Danio and tetra are schooling fish. They require 6 of their own kind otherwise they are fearful, aggressive, unhealthy. That tetra must be really cautious in that tank as he is outnumbered. The environment is not suitable for these fish. Stress also brings on secondary problems such as ich as well. I am sorry to be the bearer of bad news. If we can assist you any further please let us know ok?

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1 year ago #24
Nightstar99
Gold Member
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It won't play out in any form other than the other fish dying of stress. The tank is too small for anyone to get away and the primary danio is attacking them from stress.

Ideally you would have more danio in a larger tank.

I cant really recommend you get more in the tank size you have.

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1 year ago #25
Joni
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The problem with the fish you picked is they are not in schools and both of these type of fish love to dart, and swim over a bit wider expanse than you are offering. If I were to choose which type of fish, of these two types, that would do better in your tank... I would need to choose the neon tetras. If you do have any further questions please let us know okay?

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1 year ago #26
MBUNA KING
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Throw him in a cichlid tank for a while lol

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1 year ago #27
duvalboy
Guest

I have 4 zebra danios and have noticed that they are boss in my 29 gallon... I just added 4 neon tetras and they are bullying them ....the dwarf gourami i have is tje only fish dont mess with

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1 year ago #28
johnarthur
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Fast swimming, schooling or shoaling fish like zebra danios and neon tetras should be in groups of at least six, and they want plenty of swimming room at the mid levels of the aquarium. When two species attempt to occupy the same place in the aquarium, the result is often aggressive behavior.

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1 year ago #29
firebird
Guest

I have a 55 gal tank with 6 each of the following: dalmation mollies, sunburst plattys, lamp eye tetras and zebra danios. All was fine for a week and now the danios are trying to eat the plattys alive. Is this caused by overcrowding? I have 24 small fish in a 55 gal tank.

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1 year ago #30
Joni
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Yes, they are all attempting to establish territories but they all occupy the same area of the tank. The platy will be slaughtered or so stressed out that will kill them. Once the danio tick them off they may start on another group. Can you bag the danio and return them now?

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