Most likely 89 gal. 36 W x 24 D x 24 H Much depends on whether I actually get the free Lexan or not. with 7/16" material I don't want to span over 36" @ 24" H because it WILL deflect over 1/16" in at the midline at 80 deg. F. Then again, I may just setup an old bowfront or freeebie 55 I recently acquired, or both and have lots of separate systems where I can keep a variety of critters and corals. Or, do none at all. It's not a priority for me todauy..