Most slate tile's are safe for aquarium use, just make sure they don't have any pre grout on them. I use broken slate tile's as decoration. It will be easier to clean if you can move the fish for,.... say a week? then drain the tank, remove the gravel, cut the tile, silicone it in, let it dry for 3 days, then set it back up. I know it's alot, but anything worth doing is worth doing right. this is what I'm going to do with the DIY tank I'm currently designing.

The gravel i have is tiny black sand stuff its always getting sucked up when i clean the gravel.

I dont have the ability to re-home the fish to stick them down plus i dont like the idea of having them stuck down, the last tile place i went to he is an aquarium fan and only lives down the road he said he would come the the correct dimensions and cut thr tiles for me to fit with minimum gaps between the tiles, but the more i think about this the less excited i get about doing it.

I'll keep everyone posted on what i get up to.

Sure enough i am confused too........what ever ur trying dont do the whole make over try one portion of the tank (show us the pics) before u decide what needs to be done.

don't use the miror tiles. fish don't like the reflection below them. go with a flat black, or maybe a natural off white color.

Yeah cool guys, ill post a pick some time on sunday when do my clean and water change

I would like to see it lol

Well quick update.... not going to do the tiles in my tank but i may do it in my DIY plywood tank i'm thinking of building during my holidays.

Looking at a 5ftx4ftx2ft bought 1200lts

I'm in the process of doing up blueprints so when i finish those i'll post the drawings for judgement

BOOO!! i was waiting to see.

ooh, looking forward to blueprints