my ph is very low can someone halp

my 165L tank has a ph of 5 and i put some ph up in and it goes up but by the next day it goes back to 5 how do i fix my ph problem

Welcome to our forum. That really is a low pH, and it leads me to think that something in the aquarium is producing acid. That may happen with decorations or gravel or even a sealer that is not intended for aquarium use. Before using any more pH adjuster, you may want to change about 30 percent of the water every day for several days in a row. Has the tank completed its nitrogen cycle, and does it have fish? If it is an established aquarium, a very low pH could be the result of over feeding and too few partial water changes. You may also want to check the pH of the water supply and make sure you're getting accurate test results. Please send more details.

u can use this ph meter...

i have an internet problem while i was writing this post here ,so i post it 3 times.i am very very sry for that.pls pls pls don't mind.

Admin comment: I've deleted the extra two posts

Those pH meters are sort of expensive but very handy. Please don't worry about the multiple posts. This is all about aquariums, not computers.

thank you mr john.

Proper pH automatically adjusts and holds aquarium water at pH 8.2. Proper pH increases carbonate hardness, does not contain phophate, and also contains Aloe Vera, a proven natural stress reducer and healing agent of fish. This product is great for saltwater, brackish, and African Cichlid aquariums.

What does something like that cost?

http://discusfishcaresecrets.blogspot.com/2009/10/how- to-adjust-ph-level-of-your-aquarium.html
go through this link,i think this will help you how to adjust oh level in your tank...

Thank you. So I will leave the PH alone for now. I have just figured out that my tank is much too acidic. Is that just a matter of more water small changes?

You may want to check the pH of your tap water. The pH in aquarium water tends to decrease (more acid) as it ages, but partial water changes should bring it closer to neutral (6.8 to 7.2). Rapid changes in pH are dangerous to fish, and a 0.1 difference is quite a bit on the pH scale. Partial water changes may be safer than chemical pH adjusters.

Ph of my tap water is just right. I did check it.

would you suggest doing 20% changes every day for awhile or just continue to do 20% once a week

What did the aquarium pH measure? If the tap water has a neutral pH and the aquarium water has a very low pH, the aquarium has a source of acid. Since your aquarium is clean, the acid source could be some decoration, or a cleaning agent, or maybe a carbon dioxide supplement. If you use distilled or reverse osmosis water for most partial water changes, it could cause large pH swings.

I am using dipsticks. So the PH is measuring lower than the lowest on the chart which is 6.2 and the alkalinity is measuring lower than the lowest on the chart which is 0.
Hardness is ok. 75
nitrates is ok. 0
nitrites is ok. 0
ammonia is .05

Albert seems happy enough but alot of my lilies are dying. Maybe just because they were all put in at the same time and I remember you telling me that they did not last very long.

Any measurable level of ammonia is not good. It could mean that you are over feeding, and it could have an effect on pH. I use those dip sticks too and not just on my Ford. Of course the reagent tests are more accurate, but they were not designed for us bumbling old men. If any moisture has gotten into the dip stick container you could be getting a bad reading. It's also odd that the water has zero nitrate, which is usually in tap water. In addition, if the pH was off the low scale, it seems like the fish would be sick. To make sure about the dip sticks, you could get a free water test at an aquarium shop.

Ok, gonna do that. Get my water tested. Maybe these dipsticks are ruined somehow. I will do a partial water change and get rid of the ammonia.