My heater malfunctioned at some point last night and killed some of my fish water was at 90 this morning. Killed my 2 inch dovii 7 inch sun catfish. And about 100 convict fry. I didn't know what to do so I took out the heater and put ice cubes in and now I have a breeding pair of convict a sun catfish and a baby oscar that are not looking to well.