Maybe if you drilled all the tanks and bulkhead them together, you may be able to get away with one sump, one overflow and one return???? Whats the purpose of 3x 10-gallon tanks in a row like that? IMO
you can do so much more with one tank that is 4' or longer.
180-gallon acrylic mainly SPS, SWC 1A Cone Skimmer, APEX Neptune Controller, 3x MP40w Vortechs, Tunze 6045, Radiums 250w in Lumenarc Minis, Galaxy Ballast, BRS Dosers