Ive got this same thing coming up on my own boat. My boat used to have a 30 gallon tank on each side under the settee, but one was cut out of the boat. Ive got one 30 gallon tank under the starboard settee and an 11 gallon tank in one of the cockpit lockers. I only use the 11 gallon tank since i got it new and its clean. As for the under settee tank its fairly clean, but not clean enough. Im going to scrap all the
lines on the boat and replumb it soon. Ive got 2 foot
pumps i plan on useing since we're heading out on
anchor. I dont know if i want to put a salt water
pump to the galley since the water around here isnt that clean. Ive got another 11 gallon tank that im going to install somewhere in the boat.