I leveled it off with shims. Its in a skimmer box inside my tank and just barely fits and is sitting on the acrylic top. The tank rim is holding it up by the purple plastic piece around the skimmer middle. This is temporary until I can build another plastic egg-crate shelf last one fell apart and is a pain to do again. I want to lift it up by 2" for proper depth so I used shims.
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