You can also build a 3 high 40qt (hdx tubs from home depot) rack with a sheet of half inch PVC from home depot. I just recently built one, all you needs is 1 sheet of half inch PVC, screws, drill, saw, and heat tape or uth, tubs. I already had the tools and screws so the PVC and tubs cost me $90. I have not yet bought heat for them and I already have thermostat. I have the dimensions of every piece you would need to cut if you decide to build it.
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