None a tall. I remove it when I want to scrape coraline on the back wall, retreive a hard to get coral the fell in the back, check out my corals from the back side (they actually have better color due to the way the flow and bulbs are) and to make sure that the powerhead behind hte rocks is still running. I'll probably never paint the back ro sides of another tank ever again. Especially a built in.Do you have any complaints with the cardboard??
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