well I just brought home a 15 pound rock with alot of zo'as and star polups and a bonus turbo snail on it.....needless to say Im getting crowded and its hard to maintain the space in front and in back of my pile of rocks.......so I was thinking of putting all my rock at the very back of the tank and lean it on the glass and build it all the way up......not all the weight will be on the glass Ill just use it to steady the rocks [IMG]http://i39.photobucket.com/albums/e184/godspeed_89/misc/Picture018.jpg[/IMG] you can see I had it with a space in the front and back....I know sirculation is a problem but its hard to keep going up in a straight line with rock Im afraid of a rock slide and that would be bad....your thoughts