I have a display tank (fish only) that I recently noticed seem to be somewhat cool. I measured the temp and it was at 78. My Spidey senses kicked in, and that did not seem quiet right. I recently bought a calibrated digital thermometer to check all my tanks. Seems to me any easy parameter that I often overlook. Assuming the calibrated instrument I just received (with certification of calibration and results...if that helps, sounds good anyway), measured my water at 76.2 F. Again, fish only (tangs, wrasses, angels, etc...) Normally, one would just turn it up a couple degrees and not worry about it. However, I have NO heaters on this sysem. Between the room temp, UV sterlizer (120W) and multiple pumps, I have not had heaters on in. So, long story short, would you raise the temp or go with it?