Clown Fish/ Blue Tailed Damsel

[ReefRookie]

I'm new to salt water aquariums and I've purchased two fish to live in my new set up. The person at the store told me they would live well together but since then I've been told otherwise by people. The first fish is a very small clown fish about an inch in length the second is a yellow tailed damsel who is smaller yet and only half an inch in length. What I've heard is the damsel may actually kill the clown fish. They are the only two fish in the aquarium (two feet by one foot and one and a half feet high) along with a star fish and some snails. They dont seem to be aggressive towards each other at this time- but I would like to know what I should look for behavior wise to prevent any unfortunate occurrences or if anyone has an idea of how compatible they actually are together.