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You are honestly wasting time the egg crate and sponge idea. Just simply use straight glass. If you want, you can cut 4 pieces of pvc to support layers of egg crate (like legs on a chair). Place your sponge on the top layer, media on second and live rock underneath with no sand. You will need to occasionally need to pick up the pvc pieces and wipe the detritus off, but it will be seldom. You can google trickle down sump.
I personally have a T return and have the return in the middle with the diversion trickling down the right. The far right baffle will just be higher up and 1.5" from the bottom. Siliconing egg crate is aggrevating.
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