Floor tiles reef safe?

[MO Will]

Are floor tiles reef safe? I want to use some tiles for a skimmer stand in my Rubbermaid stock tank sump. I used a 5 gallon pail cut down to an appropriate height and then placed floor tiles on top to make it more stable. The box says Daltile Marseilles porcelain collection. If these are a concern recommendations are appreciated!! Thanks in advance. Will

 

[YoungREEFA]

I saw a tank or two a while ago with floor tile. It looked extremely neat and sleek, but the major offender here is coralline algae. Its somewhat difficult to clean and maintain a very clean tile floor in a tank. That was the major gripe of the tile users.
EDIT: wow totally missed the skimmer part, disregard the first part but yes you should be fine.