Its an Aquapod 24 that I've modded a closed loop and chiller into, I also took the back compartment out. I've also got a 29 gallon that I aquascaped specifically for baby cuttles with three shelves that each run about 2/3rds of the way across the tank at various levels. Then when they grow to big for it I've got a 55 that I can set up for them, and a buddy with a 120 that would take a few. At this point I'm just focusing on proof of concept with this one, I highly suspect that its a male being so small at this time of year, so I am fairly confident that he could live out his days happy as a clam in the 24 with all its caves (rock work in my tanks always goes from one side to the other)