homemade tanks will work but you really need a round tank as shad and herring will keep hitting the corners till thet get red nose then die there was a guy in south carolina who made a tank if you email me i think i can find his name or number as i have one but not sure if the name still on it would not keep alive much more then a day if you want something to work great should look at buying a regular shad tank ron vest creek bank easy flow blue water etc bob
Before I got my Keep Alive Tank (Sponsor of the BOC) I used to use a Rubbermaid 30 gallon trash can (Blue). It worked rather well during cool weather. I was going to rig it with an aerator, a bilge and an overflow but I just used it as is. It can be quite heave and I also had a 20 gallon for short trips. Stored stuff in it for travel before I filled it with bait too.
I took a round 50 gallon cooler cut it down in half and took pvc pipe and ran around the top of th cooler under the upper lip with little holes ever so often for my filter system. I just used panty hose for a filter and i can keep shad alive for days in there.
Actually, my bait tank is one of those large white 120 quart coolers, with an aerator. I mistakenly said 50 quart last night. I think 50 quart would be mighty small for a bait tank, but you could probably pull it off.
BB in SC