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I could certainly be wrong. I'm no geologist, but the slate tiles haven't caused any problems in my prop system. I've used ac ouple hundred over the last couple of years, and corals have taken to them just fine. No water quality issues either. I'm certainly not the first use them either. I'm just passing along the idea. I've also seen ceramic tiles used, but the softer slate allows more options, super low-cost, and since I practically live in HD, really convenient to pick up.
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Why can't my wife see this stuff as an investment?
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