What is your ph now? What fish are you keeping? Why do you want to lower it? Most fish are bred in neutral water so a ph close to seven is acceptable even if that is not what the fish incures in the wild.
haha, I have 2 convicts, a jack dempsey and an oscar and the ph is a rediculous 8.3, I haven't got my hardness test kit yet, but will be soon. I want to breed the convicts in a 29 gallon
2 convicts... a jack depsey.. and an oscar... I hope they are in seperate tanks of appropriate size =)
Peat may or may not work for you... I tried peat filtration once, and it didn't work for me. All it did was turn my water brown. I believe it only makes a good impact if your water is not overly hard... my water is hard, so that would probably explain it. Another thing you can also try is putting in a fair sized piece of driftwood into your tanks. It essentially gives you the same effect as peat.
Well, at least two of those fish will THRIVE in pH of 8.3, and I wouldn't worry too much about the Oscar, either, unless it was wild-caught. As long as you acclimated them to your water, they'll be fine in it and not die from alkalosis.
Thats awesome about the oscar, very good news, I have my jack and oscar in a 125 alone for now, and the convicts are in a 29 gallon, both tanks show a ph of 8.3. I have a piece of driftwood in both tanks. Still a high ph.
Have you tried RO water? Maybe do a fifty percent change with RO water and then wait a day and do another one. I don't know if that would eat up the buffer or not in a PH like that but then maybe if it drops your pH you could do mixed water changes with RO and tap. Or you could just keep Africans.