Providing you have access to two sides of the rack you can have Hatchling, V-35 and V-70 tubs all in the same rack, at the same time. The V-35 tubs and Hatchling tubs open via the long side and the V-70 tubs via the short side. The V-35 tubs will go straight into the V-70 rack. You just have to alter the heat cable to suit. You can also buy a side bar from Vision to close the V-70 entry. The hatching tubs need shorter spacers which you can get from Vision or make from plastic pipe. You can also get tub locks from Vision. Give Vision a call - Scott is extremely helpful.