There is a thread or two on CG location on 20 footers and the MA. Chaser's thread on his build has some, but there is a deeper thread from a year back. If you don't find it, I can look.
If that doesn't work, then a place to start is where the 5 foot long ~50gallon tank starts. I'd have to measure. The 72 Gallon tank starts in the same place- perhaps a foot (?) forward of the rear fish boxes and splashwell, and ends, well, another 7 feet forward. I put a 20 gallon tank in the forward 18" of that space, inside the console. And I have two batteries under the console. I am putting another 22 gallon whaler bench seat tank forward of my console. My original tank location is full of buoyancy foam. As are the caps, to help prevent turtling.
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