Already growing out the first member of the pool pond! It is a Redtail Cat/Tiger Shovelnose Hybrid. We will also be adding a Redtail Cat, Tiger Shovelnose Cat, and High Fin Banded Shark. Possibly a marbled gar I'm on the ledge about that and or a silver arowana. The first pond before we move will be a 8' long, 5' wide, 2' tall. Once we move they will be transferred to a 12-15' round pool possibly buried lower in the ground. And will also keep the other pool inside for the fish while our Minnesota winter's will kill basically everything I'm getting. What do you think? Also should I put in some sand? I also want to put some driftwood and maybe (if I put an extra liner inside) some rock.