I was looking at my fish today and I noticed their skin looked different on there heads. At first I did not think much of it, but now I am concerned. They are acting differently than usual. I have done different things to the tank in the last few days, maybe one of them cause a problem. I got them feeders last week straight from petsupermarked, which they have not gotten in over a month. I dropped their temperature from 86 to about 83 a couple days ago. Also I have been doing more water changed lately because they have been eating more and more. I also added a 4 inch cichla that I cough on Saturday, but that's the fish that looks the healthiest as far as skin issues. I think they are breathing a little hard that usual but much. They have been up close to the lights almost sticking there heads out of the water. They usually push each other around, but not today.