Hi Everyone So I woke up this morning with the temperature of my tank down to 73 from 81 during the day. The thermostat on my heater must be off because I can't get it to reflect the actual temperature in the tank (it's on when the tank is at 80 degrees and the temperature is set to 76). So I set it back up and got the tank back to the normal temperature the next day. My question is, could this have killed one of my fish? My purple firefish wouldn't eat this morning than I found the cleaner shrimp had taken his home and next thing I knew he was dead . He was doing so good yesterday. My two clowns are fine and my cleaner shrimp/emerald crab are both still doing fine as well. Are there any tips in keeping the temperature at a steady level? Getting a chiller is not in the budget. I was thinking a clip on fan from Walmart or Target and getting a new heater to hopefully keep a steady temperature. This is my first marine fish loss and now I can't help but think something else is going to go wrong.