We have a 450-gallon aquarium that is 42 inches deep, 96 inches long 24 inches wide. We set it up with the fluval filtration system, automatic water changes, lighting, and air pumps. We also have a Neptune Apex system to monitor the tank. Because we live in southern California it is hot, but we keep the air conditioning on in the house at around 78. Our water temp. has been around 80 degrees so we turned the heater off a week ago. Last night the aquarium temperature spiked up to 90 degrees. We are installing cabinets above the tank and 2 out of 3 cabinets were installed. We have two air pumps-one for deep water 150 and another whisper pump that was not made for deep water, which seemed hot and made lots of noise. I unplugged the whisper pump in case that was the culprit and ordered a deep water 300. I have been putting frozen water bottles in the tank to cool it down. It is now 86 degrees and dropping. Could the cabinets above the tank be the cause of the temperature spike? Could the airpump that was not designed for deep water be the cause? We have Lake MalawI Mbuna African Cicchlids in the tank.