Buy one of those cheap Rubbermaid trash cans and test it out on the water. This would be the best way to find out. The water weight is what gets you, close to 8 pounds a gallon. I have a 50 gallon on mine but I changed things on the boat so much, a real comparison wouldn't be possible. The stern definitely sits a few inches lower in the water when the tank is full. Some of the tanks have two levels which helps. I'd probably go something in the mid 30 gallon range, just got smoking deal on my big tank.
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