I don't see a problem with it I have seen many tanks that have this done. However it makes it very very hard to clean your glass in that area. I have a coral that has gotten close and has now been fraged by my cleaning magnet. Hth
Mine leans only on the back and I let corraline grow there. One thing to think about is that it will scratch your tank. So before leaning it against a side, think about if you will ever need that side to be a "viewing" side.
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