the_deeb;4659977; said:If that's your concern, plastic eggcrate would also serve the same purpose. That's what I stick underneath my big rocks.
I had thought of that, but was concerned about two issues:
1. What if the fish dig the sand out, won't the eggcrate stand out? I think the tile might be hidden under the sand better than the eggcreate since I can color match it to the sand and it is flat.
2. Wouldn't tile be stronger than eggcrate? I know ceramic tile isn't stronger per se, but eggcreate breaks so easy.