I have a 66G tank with 10 discus, I trying to know all I can about these fish and am having some difficulty. My discus are acting a little weird in which they dart and brush up against things in the
tank. I don’t think they are sick. Could it be something else. Q I also would like to know how to tell between male and female.
Reply:
The discus fish dart here and there, could be parasite around the body or gill bit to irritate the fish. Apply Potassium Permanganate.
