I am building a rack and was wondering because i skimped out on the rack a Costco rack same material same thickness just the racks are not as wide, only 18 inches so for a 28-quart tub which are 23 inches long, would that make a big heat difference? with 5 inches of the tub sticking out? before I make it and put snakes in it I want to make sure there won't be any huge problems with heat? heat tape I have 6inch flexwatt and will probs be putting 2 ball pythons in it right away just checking to make sure they are safe.