Can you give us details on what types and sizes the tubs are, rack type, etc.? That way the people who have experience with racks have more information to work with to give helpful answers. I can see non-convoluted situations where it would be reasonable to have both sizes on one control, or where they'd be better off separated.
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Sure! I use a PVC rack. There are 3 tiers with 2 16qt tubs each making that 6 16qt tubs and there are 2 28qt tubs which take up a row each