Ha ha, you should have seen the setup I used to have! Three hundred gallons with biofilter, chiller, and a pump to keep constant current in the water. At different times I kept creek minnows, shad, shiners, tuffies, and even a few bluegill and trout. I have to say, it was pretty neat.
Alas, just as I got the system perfected, I started fly fishing and gave up bait fishing almost entirely, so I didn't need it anymore!
The only thing I had trouble with was buildup of nitrates - and doing frequent water changes on a 300 gallon tank is not a task for a lazy person!
I think I could have conquered that problem easily if I'd been able to put the tank in a place with some sunlight, and then circulated the water through a
second tank filled with live plants to absorb the nitrates. That would have been the most amazing live bait storage system ever! Unfortunately, my wife might have had them come and take me away to a room with padded walls if I'd tried to build something like that.
bd