[JasonJ]

due to the dimensions of my 70gal cube tank. (30 x 30 x18)

i need a sump that will fit under it.
i was thinking a 20 - 25...i dunno if it will be big enough?

i have a 33gal..but its 36inch long. its not an option.
any ideas? i will be using a ER RS135 protein skimmer.