Ok here goes:
55 gal tank, dual bio wheel filter system, various population of guppies, silver fish, clown loach, pleco.
I checked Ph after my mollies started dying off. I never had any problems, now Ph is 8.5+ off the charts. I did a 25% water change first, cleaned gravel and used Ph down. Still high
Next (about a week later) a did another water change.....still high. I bought this powder staff that is supose to "automatically" stabilize to 7.0. What a crock! Still high! I look a little bit ago and one of my clown loaches has died.
No sign of disease, or fungus.....nitrite, nitrate, hardness is all with in normal, but Ph is still high!!
Hmm...not sure whats causing it...might still be the tap water. Any snail problems or anything like that? I'd check the tap water and go from there. Also those chemicals you were speaking of can be extremely harmful to the fish so until to find out what is causing the problem in the first place.
This is odd. Mollies should be able to tolerate that pH. Mollies prefer high pH. I'd be careful when lowering the pH. What are your KH and GH? Test both your tapwater and tankwater.
Pls stop using the pH down. It will do nothing but harm your fish. Once its effects wore off, the pH will swing back to its usual level. If the difference is very big, your fish will tremendously be harmed and eventually killed.
You must determine your GH and KH. If your KH is very high, you'll have a difficult time lowering the pH.
Pls post the exact figures of ammonia, nitrites and nitrates. When did you start your tank? Was it cycled? When did the problem start? How do you maintain your tank?
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