I've used Plasti-Dip wih success but not on the bottom though. Only thing is with bottom dwellers they might rasp on it...my synos did that and then the cichlids joined the party, pulling off pieces. Nobody got sick though, its inert once dry.
Doesn't crud accumulate under those tiles, though? I heard that being an issue when they're lifted up.
Doesn't crud accumulate under those tiles, though? I heard that being an issue when they're lifted up.