I had my pyxie in a all water set up until yesterday (had him since July). He did really well, until it seemed he was shedding excessively (but it could be my paranoia). I have him on ecoearth now. But while he was in a water set up, I gave him slate to get up out of the water. As he got bigger (and produced more waste), I invested in a huge canister filter, which did a good job keeping the water clean. Part of the reason I had him in a water set up, was because these guys tend to accidently eat a of the bedding. I know people say it won't hurt them, but I've read and seen things to the contrary (this is mostly a baby frog problem). Since he's a big boy now, I think any bedding can easily be passed. If you keep him in a water set up, you'll need to change that water almost daily.