Kenn, you have the same concern as me. Pleeease don't do this...take it from someone who did it...and regrets it every day! I did that in my 10g QT tank (now my main tank until the 150g is finished). There are "hundreds (arbitrary)" of dead pockets. The bottom of the tank is open, and I can look up under the tank...and the entire bottom is just black nastiness where there's eggcrate. I try to vacuum the sandbed weekly, but the eggcrate makes it nearly impossible to get out the gunk.
+1 on this.
You have in effect an old plenum system which I believe has fallen into disfavor for these very reasons. If that was my tank, I'd take a weekend and eliminate it entirely.
For now I'd get that skimmer going ASAP, it can make a big difference.
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