Brett,
No, the Frogfish isn't safe with small fish and invertebrates. They can swallow anything up to about ¾ their size and will try to swallow fish even larger. I have it in a tank with clams, large urchins, brittle stars and turbo snails all of which are too large to eat.
The only thing at risk in the tank is a Green Chromis. The chromis stays at the water surface and is a very active fish so is hard for the frogfish, who can’t swim but instead walks on the bottom, to catch. Any fish that goes near the bottom wouldn’t last very long.
I originally had the Frogfish alone but couldn’t get him to eat. Once I added the chromis the frogfish started taking frozen foods. It appears I need to have the motion of a live fish in the tank to stimulate the frogfish to eat. When the frogfish starts paying attention to the chromis I know it is time to feed it.
You can keep a frogfish in a tank with other fish larger than them and no shrimp, etc that they can eat. You also need to be careful of fish picking at them mistaking them for a piece of algae.
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