hey i was wondering instead of using rocks or pebbles to cover the bottom of a fish tank if you could use those 12x12 squares of vynel kitchen/bathroom tiles its the ones with the paper u peel off the back and there a little sticky and u would put some tile glue down and then stick em on but in this case instead of glue i would use silicone but its got no ceramic or grout involved just a square floppy lookin tile real light ya know what i mean? that would be safe wouldnt it?