Most of my fish are sick( ich/fin rot/ cotton wool)
3 of my white skirt tetras died and 2 of my platties. The remaining platy and tetra along with my dwarf gouramis have ich (my 2 catfish do not). I have not cleaned the water in a few weeks because I put 1 month ich medicine in the water. Problem is, this may have caused problems with one of my dwarf gouramis. He is in isolation because the other fish started nipping at his fins (.5 g isolation tank, he isn't swimming much and it's all I have), I think he has fin rot and cotton wool disease. I have put a little bit of salt in the water and made sure it is clean, although i don't want to mess with it too much as he is clearly unwell. Is there anything else I can do without buying medicine and how long will it take to heal?