I think your math might be alittle bit off.
The ARS 30 series tub is 28.85 qts (21.5*15.5*5=1666.25/57.75=28.8528)
The Freedom Breeder Medium tub is 29.8 qts (21.5*16*5=1720/57.75=29.7835)
I use Vision racks and their medium is 20x15x5.3 27.5 qts, so just alittle smaller than the ARS and Freedom Breeder. But it works pretty well for up to about 1000grams or so.
Hope this helps.









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