Last reef setup I had was in Florida, so had to be careful with cooling off the tank. Here we keep the central air at 75. Have 4 five ft t5s and 3 reefi duo extremes inside an open canopy, haven't decided if return pump will be internal or external yet. Thinking about putting some fans in the canopy and run them off the icecap controller. Should that be sufficient? Tank is a 240 6' x 2' x 30"