Looking great! Tile huh? Love that idea. Does it need to be a certain type/brand of tile? And do you need to caulk or glue the pieces together, or will fitting them as close together as possible work? I ask bc I really want to incorporate this into my next build, but some type of black tile
The tile is nothing special. Got it from Home Depot, it's called travertine tile. From what I gather, people say don't use the "honed" version but that's all they have. I'm using it and tank is fine. You do not need to caulk/glue them down. The down side from what I can see would be detritus trap under the tile. I'm thinking with a layer of sand under it won't happen.
The tile eventually gets covered in coralline algae. With black sand it does but with tiles it will.