When I get home with the bait I put them in the bigger tanks I have in the garage. My garage is insulated but not heated or air conditioned. The temp very seldom goes below 40 degrees all winter so that is pretty much as cool as the water gets.
The two tanks are 150 gallons each. I try not to put more than 100 baits per tank. If the baits are mostly over 4 inches I reduce the population some. This water is treated with salt, “Prime”, and “Sure Haul” in the same proportions as in the boat tank.
My home tanks do not have a filtering system. I use about 4 inches of gravel in the bottom. This lets the poop and scales settle to the bottom of the tank. It still creates an ammonia issue but I address this with weekly water changes.
About once a week or twice a month depending on how many baits I have, I pump out about 1/3 or the water and replace it with fresh water. I put additional salt and “Prime” in at that time. This tends to keep the water pretty clear. If I start losing baits I change out more than 1/3 of the water.
The other thing I do to help the Shad survive is heavy aeration. I use an 110V. Pump with two air stones in each tank. The stones are very fine pore 6 In. X 1 In. There is a lot of air going in each tank. From September through April I can keep baits for over a month. I monitor the water temps and as long as it’s 70 degrees or less this system works very well.
I can keep enough Skiatook/Sooner sized bait for three trips. So I only have to make a bait run once a week or so in the spring. Sometimes more often than that when the bite is really hot in April and May.