Ok well I got a new tank and I set it up and when I added the water the tank temp was 78f( it takes skill ). Well over the next couple days it fell eventho I had a stealth heater that was on 80. It eventually got down to 72 when I turned the heater to 86 and the water warmed up to 75. But it was too late, my rainbow cichlids were flashing so I turned my heater to the max(90) and the tank is at 80. That is as warm as I can get it, and I know I need to get it hotter but I can't because the heater is at max and my other heater is in use at my other tank and I am sort of broke ATM so I can't buy another heater. What do you guys recommend I do?