Weight is not a problem. I have a friend who was a 300 gal livewell in his boat. The livewell would be used to transport live bait 100's of miles, hence the large capacity. His was custom made. I was thinking of using one of the commercial style coolers which are approx. 4'x4'x3' which about half full would be around 200 gal. Drawbacks are the thing probably weighs 200 lbs. empty and costs over $500.
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