I went to Island Pet and I was told if I raised the temperature it will help control the ich. I didn't know that was a bad idea

. Yes 8 years is a long long time, I cried like a fool everytime I take their body out from the tank.
I used to have a lot of hair algae in my tank, but since I use bio pellet they starting to decrease more than half, so Jeff said it releases the toxin and takes away some oxygen from the tank. I was thinking he was right because I had 2 fish die at the same time when hair algae gone. That's why I thought I might need to add an extra powerhead. Nobody knew even myself but that was the beginning of the ich outbreak.