My temperture was 89 degreeF, but the water currents was quite strong, will fishes able to survive this way? I have a FOWLR tank, and no corals and invertabrates are intend to place in. I do no wish to buy a chiller or place ice bottles in the tank, as I don't want the temp to rise and drop when ice melted. Cas I'm afraid the great change in temp can cause harm to fishes. I haven't buy any fishes at the moment.