OH NO. So how do I treat both tanks and the bad news is there are guppy fry, corydoras and neon tetras which are scaleless and probably will suffer from meth blue or salt. I just addded a little amount of salt ( 1/4 of how much I should dose) and I do WC every 2 days.Hi all
I have used meth blue many many times following the instructions for over a fortnight at a time without having any issues with the beneficial bacteria .
Aquaticguy you now have ich in two tanks.