I am going to convert my 20GAL (long) into a sump for my 55GAL. I bought the glass dividers yesterday at Lowe's, 4 each 1/4 thick. Tonigth I am going to clean out the 20GAL, currently occupied by 2 Florida Whelks, 3 Conch's, 3 Sand Dollars and a Conch shell with several large Barnacles and I think, a small Emerald Crab living in it. I am going to put the Conchs, Whelks and Sand Dollars in my 55GAL, and the Conch shell w/barnacles & crab into my 30GAL Reef. I will take pictures of the whole process and post them up. I bought a HO Overflow & 900GPH return pump from horseziggy so I have all the components to build the sump. I'll have my heater, HO protein skimmer and LR/LS in the sump with a hood w/FLOR light. I am hoping to grow some beneficial algae in the sump for filtration also. I bought a diamond grinding bit for my dremel to round the edges on the glass. It's quite sharp when they cut them to the desired dimensions. I'll start the process tonight so wish me luck!