A cheap shelf, a 2, 3 or 4 shelf unit can be got for a few bucks at goodwill.
Set the tubs on the heat tape, plug into t-stat and wala.
I have been in-between for 2 years, lol, I understand in-between
The water could/would get on the heat tape, maybe under it, maybe in the connections, and then you have to let it dry, or blow dry it, or...it just seems a hassle is all
Locking tubs work great, I've been using them for 2 yrs and had no issues, except me forgetting to lock themlol.
34 qt tubs bottom and middle and 15 and 6 qt up top.
40 qt sterilite ultra locking tubs
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