I would rather do my 75 and my 55 daily than do the 15 with them in it. For one trying to clean the sand when its 8" up the front of the tank and bare glass in other spots and not disturb the shell colony they set up is a pita. And one part of me wants to just level the sand and move the shells in some order and the other part don't want to disturb them...Am I nuts? Well I was wondering what every one else does? leave it as the fish make it or level the sand every so often? Don't get me wrong I love these guys but sometimes ............