Calci sand is safe, but it is very expensive. A better alternative is to buy the largest kind of gravel possible. If you are using food from xenopus express, they sell a larger floating food. Reptomin sticks are also pretty large, so I wouldn't worry about it getting stuck underneath.

Some people also use a plastic dish at the bottom of their tank and train their frogs to eat out of it. Clawed frogs are not stupid. They have bad eyesight, but with patience, you can very easily train them when feeding time is. I used to turn my filter off, and tap the glass, and they'd come rushing to the top of the tank for hand feeding.

You can also try making your own bottom, using Great Stuff and epoxy paint for a naturalistic looking rock wall and bottom, but that can be expensive and time consuming.

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