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Eggcrate or HDPE cutting board material would be good. I've seen concrete pavers used as reef foundations without either, though, and there really isn't an issue as long as it's stable/doesn't rock back and forth.
Lookin' great-good work, Kevin!
Cheers,
Ray
__________________
The true sign of intelligence is not knowledge but imagination.
Albert Einstein
Current Tank Info: 360 degree walk around 300 DD island–4 300W & 2 165W ViparSpectra, 4 Kessil A350W, 2 A360WE, 3 XF150, 1 XF250, 1 XF350 Gyre along with 2 PP40 and 2 IceCap 3K gyre for robust current. Basement 150 gallon RubberMaid sump, SKIMZ skimmer, DCP18000
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