disinfect the tile?
maybe this is a dumb question... but why disinfect the tile? unless there is something wrong with ur beardie?
i just scrub the tiles off in lukewarm water every week.
if there is something wrong, like a parasite or for watever reason, i use a bleach solution diluted in water. the only thing is watever i disinfect that way i let dry out completely for at least four days.
hope that answered ur question.