With the low Ph in your big tank that level of ammonia should (luckily) only be minimally toxic - still needs looking at but probably not doing too much lasting harm.
What is your nitrate and ph out of the tap?
I know people say nitrate of 40ppm is too high but I've been fairly reliably told that all but very nitrate sensitive fish can cope unaffected by much higher levels.
the nitrate is 10 as I checked last nihght. haven't done ph will in a bit just comfy on settee at moment!!
why the low ph on this tnk though compared to othertanks in room of 7.2 and 6.6?







