As I have said many times before, a stomatopod is not just a stomatopod. Different sizes and species have different feeding requirements. I have advised on several occasions that medium to large O. scyllarus be given hard shelled prey to provide exercise for the raptorial appendages. That doesn seem to cut down on appendage loss during molting. However, I don't think this applies to many smaller smashing species, especially animals under 25 mm. Our field data suggest that most species this size or smaller do not specialize on relatively large snails. They eat amphipods, very small newly recruited crabs, isopods, tiny shrimp, etc. Many actually take macro-plankton out of the water column. They may take snails, but usually only when the snails are just recruiting an are only a few millimeters in diameter and thin shelled.
We feed most of our small stomatopods live brine - at times treated with Selcon. Mysids and amphipods are also good.
Roy