Hello sir. My flowerhorn is very stressed and always stays near the filter and don not move at all.if i go near the tank his colour becomes dark black. I use to cover the tank from 3 sides to make him comfortable.please suggest me something.All this happened bcoz of white poop disease.i treated it with metrodinazol and in 2 days white poop disappeared but still he is in stress. Shall i try Api stress coat plus.