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I think you may be okay. My grouper never went after snails, and I've never had a lionfish that recognized them as food. The trigger might mess with them, but pink tails are pretty mellow compared to others.
I'm not sure what species a black rimmed moray is, but if it is a piscivore (not a pebble toothed eel such as snowflake eels and relatives) it probably will leave them alone.
I'd try a few you get locally that aren't too expensive to test. sometimes LFS stock olive nerites in FW tanks - these are really brackish water snails that can be acclimated to full salt. They aren't too expensive. (I feed them to my mantis shrimp.)
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