It will all depend on how big th eclownfish is relation to the other fish. Lions will only bother fish which it can fit into their mouths. Triiger will depend on what type of trigger and eels same thing-what type. there are a few "fish-safe triggers" like blue cheek, pinktailed, niger which will leave a large fish alone, Other triggers like clowns huma, picaso will not.
Eels-same here, the snowflake, zebra, chainlink are pretty fish safe until they get big, but any fanged tooth moray will catch and eat fish.
What type of fish are you talking about
frank