Cooling in a pinch

What size tank do you have? Power heads add heat.. some more than others. I did an experiment with a Seio 820 in a 32 gallon trash can and a Koralia 4 in the other. The Seio was several degrees hotter the next day.
External pumps add less heat. Run lights less hours per day.
I used 3 big bags of ice that you buy from the store once. They melted fast and brought the temp down about 8 degrees.

 

I froze 2 liter soda bottles and floated them in my sump, There are also diy chillers online made from mini fridges. I considered that rout but a buddy hooked me up with a chiller and just in time as I live in florida and it cooks here. I was pushing into the upper 80's as well. YIKES!!!