so in the past three or four days all my fish died! I had a bunch of guppies platies and mollies. My heater was on 80-82 degrees. I put in disease killer and ammonia, nitrate and all of that bad **** killer. when they died it looked they were shedding. Maybe finrot? Help and also before I put the fish in I cleaned out the whole tank. I need to know what is wrong. I feel terrible.