Black Ceramic Tiles

[celaeno]

are black ceramic tiles that are only glazed on the top aquarium safe?

i remember reading that the tiles must be glazed everywhere with a non-toxic glaze to be safe.

is that true?

ps. i posted this on another section but didn't get a definite reply.

 

[Rooster]

Seal the back with acrylic (superglue) or silicon.