From FrugalReef

• Disposition: Primarily peaceful. Do not mix multiple breeds of clown fish.
• Hardiness: Hardy, good for beginners
• Also Known As: Anemone Fish, Nemo Fish.
• Common types available: Percula Clownfish, Maroon Clownfish, Tomato Clown, Pink Skunk Clown
• Reef Safe: Excellent
• Feeding: Clowns are omnivores that will eat nearly anything offered to them.

Clownfish are very popular and beautiful fish prized for their orange coloration, their interesting behaviors and their peculiar and very active swimming pattern. They are well known to non-hobbyists as "Nemo Fish", from the movie "Finding Nemo".

The most interesting aspect of these fish is their symbiotic attraction to anemones. Different clownfish are compatible to different anemones, but when a clown fish does find an anemone it likes, it will "test" the anemone by repeatedly swimming into it and then out of it again. During this time the fish builds up a protective slime that will keep it safe from the anemone's sting. If you buy a clown fish, make sure you buy a suitable anemone to go with it. An experienced marine fish dealer or Hobbyist should be able to help you select a suitable anemone.

All clown fish are born male. The most dominant fish in the school becomes female. The second most dominant fish will be her mate. If she dies, her mate will become the new female. The males stay small, only the females grow large.

[edit] Clown Compatibility

Ocellaris Clowns usually aren't aggressive towards other kinds of clownfish.