I have a 32.5 gallon Fluval Flex Saltwater mixed reef tank. I was wondering what the best item to cool it would be besides using a chiller. The dimensions of the tank are roughly 32.5L x 15W x 15H inches. Ideally I am looking for something that could run automatically, such as a fan with a temperature sensor. The hottest my tank would realistically get would be around 85-87F. Thanks for any help.