Aluminum would be my last choice as long as the tanks are less than 100 gallons each.
I think...(under no real scientific reason other than if not baffled well...sloshing) I would prefer a tall vesus short tank.
I'm thinking of building my own fiberglass tanks, maybe 2 - 75 gallon tanks where they would conform to the bottom slope... something like 20 in x 30 in x 30 inch.
Building my own allows me to place the fill. vent, crossover, feed and sight glass ports where I want and not where some manufacturer wants based on production needs without the massive "custom" costs.
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