Question Regarding A Plenum!

Lakemontfishlover

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i have a 35 gallon hexagons tank I’m changing from gravel to sand. On YouTube I saw how to make a plenum. Could I place even bio balls on bottom of tank, add plastic mesh on top and material ground cover material to top of mesh, then sand on top of that? Would that keep circulation under the sand? Read if I do that then no need for pumping air under the plenum. What’s your thoughts?
 
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