So I've had a FOWLR tank for quite some time now and I am looking to get my first coral of some sort. Now, I currently have 2 strip floursecents and am looking to upgrade my lighting. I am going to get a 36" t-5 HO double fixture and am worried about the heat difference. My tank stays around 79 in summer and can't afford any more heat! is there a huge heat difference between T-5 and T-8?