thank u all i have in hand 3 emperor 400's and a emp 300 and a sponge filter rated for 100 gph but but i am putting this fish tank i my bedroom room and since my room is'nt that big but small i try to conserve as much space as possible and with this new tank im getting its 18 inches wide i could buy a 24 inch wide 180 g tank but i really need to conserve space so a emperor 400 is pushing me 5 inches from the wall so im getting the fluval fx5 to conserve some space but how far will my tank be from the wall if i use a fluval fx5 my thought was my tank would be an inch from the wall since i will only be running a tube plz confirm me on these thoughts