It is a 55 gallon tank. I have a reef ready aquarium I am selling. I bought it a few weeks ago and while moving it we cracked the tank. The tank does not leak as of right now but I cannot guarantee the crack won't spread. Would best be suited as a terrarium. Although, there is an overflow and two holes drilled in the bottom behind the overflow. Those would proboly need to be filled in. The canopy and stand are very nice. Real wood, not crappy plywood. Asking $150 obo or will trade for aquarium supplies like powerheads, T5 retrofit lights, base rock, etc.. PM me through the forum if interested.