Hey Still,

If you have a swim platform you can put a rig like you are talking about out there so that you don't have the water sloshing in the floor and it saves that space.

Just a thought.

I think it depends on what bait you are trying to keep alive. Mullett seem to tolerate pretty poor conditions, poogies (menhaden) die if you look at them wrong.

I would think eels and spots would last pretty well in what you describe.