This cooler has semi-rounded corners in it(if you look closer).
The shad did not bunch up in the corners. I did overload it on purpose. Just as a test. I will put some water in it tomorrow and show you the circular water flow around the tank. It is very good. I'm not a guide and 50 baits will get me thru a very long day of fishing. As well as my limit on stripers. This was just a project for me as I am a Manufacturing Engineer and love a challenge. It does filter the water very well. I just thought someone might want to see an economical way to keep a few shad alive for a day of fishing. We have a 20 gallon purchased round tank also.(Around 300 bucks,and not insulated). I will take some close-up pics for any that are interested in the construction.
Gofishnow... Don't haul water .... get a small bilge pump, drop it over the side of the boat with a long hose on it and pump the lake water right into your tank, and then when you are thru, drop it in the tank and pump it right back into the lake.