Clownfish are usually like garbage cans - everything that fits will be taken in.
Though some are pickier than others.
Flakes and pellets of the right size and composition are generally well accepted, though sometimes it may take a while to get them used to a food.
Frozen copepods like Cyclops, Calnus and the like are usually ideal. Even Daphnia will be fine.
Mysis is usually also well accepted, if it has the right size.
Brine shrimp, while generally well accepted, is a food I would avoid long term. I would only use them as a starting food.
Larger clownfish will also take chopped squid, clams and whatever else they deem edible.
Clownfish will also graze on algae - I've seen some of mine go after GHA.
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