Well... I decided i want another bimac tank. I couldnt put it in my other tank since i had put coral in other and had no place to put it. So i got a 75 gallon glass aquarium. For filtration i got CPR SYS 192 filter package. Since the volume of that is only like 6 gallons or something i put it in a 20 gallon tank. It is all in a sump. I have a chiller hooked and i am running it at about 63 f. I definitely learned not to trust my lfs. They had a 60 there which is what i was planing to get. I got it home and i got all the 5 GALLON JUGS!(you do the math that is a lot) I start to fill it up and it hits the top of the tank at only 48 gallons! After that i checked my measurements and every thing esle it all turned out to be only about 49 gallon tank. So i had to call the fish store and tell them. A corse they didnt believe me so then i went up to them(45 min drive!) They measured and were speechless.(the guys face was so funny when he put he numbers in the calculator ) So after a lot of talking we decided to take a 75 home. I got home and i had to get all 48 gallons of water into 5 gallon jugs and then get more 5 gallon jugs. Then put about 60 pounds of live sand in it. I learned two things from this: 1 Get an RO machine! 2 Dont trust your lfs. So here are some pictures of the tank and over flow and sump. The only question i got is how should i octo proof my over flow? It is an external. Also do you think i need to octo proof my return? It is just a J hook with a pvc elbow attached to it.