If you have glass tops on your tank you can remove them and that will help. Take 3-4 pop bottles if you have them and freeze them and put 1 or 2 in your sump and that can help, I keep 5-6 froozen all the time just in case. PC's are known for getting hot and warming up tanks, if you have a clip on fan use it on the display or sump/fuge and that will help a lot.