I was thinking of putting the intake hose into one of the thru-hulls for the floor drain for a pickup tube, probably another hose right over the side. It's an aquasport fisherman (the old 80's cuddy) so I'd think I'd rather go tall than wide, but also probably don't want anything over 25 gallons...there are tons of things to pick from, I'd just like to see if there's advantages/disadvantages to any particular setup. (I looked at the cooler idea too, which could work for one of those square jobs, but like you mentioned, round might be better)