I'm jumping in late here (sorry), but if you've put fish in the tank to "help with the late stages of cycling" or to "settle spikes"...you either haven't read the links previously posted or you didn't understand them.
If you've been adding an ammonia source (shrimp or pure ammo), and have introduced fish during this process...it is a deadly environment for your fish. I'm not familiar with temperature conversion, but if you have the heater cranked up for cycling...that is also a problem.
If there are ammonia levels you've added to the water, depending on how high they are, you need to do MASSIVE pwc
Since you have fish in the tank, address the problems you have and please read these next two articles. If you don't understand...ask questions. Adding fish when you are unsure of the process is the absolutely last thing you should have done. Sorry if I sound rude