I have to agree, after numerous rearranging of the rocks, I found that if I only lean some towards the back glass, thats best (at least for me). This way you can still clean the front and sides of the glass with no problems. You really can only see the unwanted growth on the back glass from the sides, which usually isn't even seen by on lookers---they are to involved in the uhhhhh/ohhhh from the front of the tank. I can still clean most of the back glass, but I perfer to let my snails have a go at it, that way they are never hungry. Just my .02 worth HTH