I have a 30 gallon tank its well planted and i have a few barbs, kribensis, gourami, balloon rams it started with my gourami which i first detected and took him out as he had fluff on his fin and was scratching himself against the gravel. I have placed him in a hospital tank and treated it and make water changes. I put my filter off and put treatment in my 30 gal as well. I also made a 25% water change but today I noticed my barb scratching himself on the gravel. I also checked my water levels PH & NH levels are normal WHY do I still have Ick i check my tank daily??????