A bunch of the guys in S FL were tiling their tanks with travertine. Same idea - when a tile gets encrusted, replace it. It's CaCO3, so good material. I would do an acid bath with it first to get any manufacturing/transport contaminants off of it.
Don't want to hijack clown man's post...I got the idea from him.
My newest pic...I can try to get a better 1 tomarrow....almost every inch that my leds hit bottom has coraline..to the point now the tiles aren't flat n e more...it's making its own ridges.
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