I agree.........Discus do fine in all levels of PH as long as you're not breeding and raising fry.3dees;4845103; said:ph 6.4. what are you saying? I have wilds in 7.6 and they are doing great going on 9 months. domestics are kept and bred in ph as high as 8.6. add a bunch of crap and chase your ph and you will have more problems than just leaving it alone.