Mobile Bay Reef Keepers

What size is this Half Hex I picked up from you, and what size is the sump. Do you have the old sump that you decided not to use? If not what size was the sump you removed and why did you remove it? Why am I asking so many questions ? Just hard to get a decent pump to fit into this narrow sucker and the sump does not allow for much error in water loss. Looks to be 5 gallons.

its 26 gallons, and the old sump was 18 gallons, but it wouldnt fit...it was too big

Would it not go in from the front or go in through the back.

Mike what are the dimensions on that 18 gallon and do you still have it