Reef safe tiles

I would like to get some tiles to grow some montis and chalices on. Can I just go to Home Depot and buy ceramic tiles or do they have to be special reef tiles?
 
i use tumbled marble tiles . been using for a while. they cycle similar to dry rock. just added about 50 to my sump last weekend
 
+1 to Victor's link. I love these tiles. Smooth surfaces and they look great once everything grows onto them.
 
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