I found unsealed travertine tiles looked and did the best for my bare bottom tanks. They quickly covered in coraline, and many corals seemed to grow faster on the travertine then on normal LR (though it was possibly my imagination). It also has the benefit of turning your entire bottom into a ready made frag rack of sorts with all the nooks and crannies that pods and sponges love.
Last edited by FitoPharmer; 10-15-2012 at 05:49 PM.
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