ammonia is 2, nitrite is 0, ph is 6. I have 4 x clown loaches, 2 x dwarf rainbow fish, 2 x algae eaters, 1 x female fighter and 1 x male. We had 10 tetras and 5 rummy nose now we have 8 tetras & 3 rummy noses. The remaining ones are turning black and can't stay upright. Any ideas?
I did ask...