I have a 12 gallon nano with a stand and upgraded lighting ... it's 15" front to back and 14" side to side. Of course it has the fan in the canopy, powerhead in the "sump", and I'll include a 1 gallon bag full of sand. If chaeto helps, I'd throw some in also. I'm also offering a free frag from my 65 gallon LPS/SPS/softy mixed reef. All this for only $120. No scratches, lights all work well, only 3-4 months old (everything).