The bait tank sounds like what Hawaii people use. The garden hose is extended at the height of the gunnel or splash board to let overflow go overboard. People use the tank for live opelu. They need the round drum for continuous swimming. If you use a cooler or fish box, they cannot swim continuously without getting their face busted.
Small bait can handle the square coolers or boxes.
Well, I am going to cruise your page again for a few minutes and start my day. See you after my next trip.