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I have my rock leaning on the back glass in sections of my tanks. I leave the sides clear though for cleaning. Just make sure the rock is secure so it doesnt crash against the glass or shift and break it.
Looks good if u spray paint the back blue or black u will not see all that plumbing !! I prefer black fish and corals look great against it !! Leave room on the sides so u can clean the glass just enough for a mag scraper is fine if not its a pain