Ok i just got done building my rack about 2 weeks ago. it holds 4 28 Q bins. At this time i dont have anything on the back besides a thin board to stop the bins from sliding to far for the snake to get out. It seems to hold temps i have a Ranco thermastat running my 4 inch flex watt. And i also wired it parellel . If u want wire it that way like if u have 6 bins then wire 3 on one cord and 3 on the other. That way for some reason u are not using half of it u dont have to heat it . Hope this helps
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