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I prefer eggcrate covered with a layer of Aquarium Filter Pad Media (https://smile.amazon.com/dp/B01KYS02EG?ref=ppx_yo2_dt_b_product_details&th=1), covered in turn with a piece of fiberglas screening. Then I use silicon on the edges to completely attach it all to the tank walls. Finally, if you don't put a bulkhead below this draiange layer to automatically drain out excess water into a lower sump, you'll be wasting your time and efforts. I've had three tanks like this running for 9 or 10 years now, and I've never had a problem with the drainage layer clogging.
 
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