Originally Posted by duluoz
oh, yeah. I have a heater. I took it out in case it had been malfunctioning, since I don't know for sure what the problem is.
Any advice on how to lower the temp?
Put the heater back in, I'm assuming it's a pre-set heater so set the temperature to around 78F.
And just leave the tank, it should cool down by itself, I wouldn't recommend any other way. Putting ice cubes is bad idea, because it's not de-chlorinated ice cubes, also I think it'll change the temperature too fast and might cause a shock to the fish in the tank.