Well i wasn't planning to buy a tank today but oh well. Anyway it was a deal I just couldn't pass up. Its a 58 column tank and it was used for salt water. It has an overflow drilled into the tank and its got what i think is a Refugium under the tank. I've set up wet drys before but this one is different. Its a 40 gallon tank under the 58 and I don't see any Bio balls. My question is what creates the Biological filtration? Do i put substrate in the tank under the main tank? There are also a couple pumps and lots of tubing, oh crap what have I done? On a more positive note the seller had no idea what he had and i got the entire set up for $40.00. Can you freakin believe that? It even has a Canopy and its beautiful so even if I have to buy something I'm still so excited right now. All of this just by going to yard sells today. Wooh.