Aquarium trends come and go, especially when it comes to livestock. Rose bubble tip anemones are extremely popular on aquarium forums, and usually demand a higher price for this. Duncans, on the other hand, have lost their luster in the eyes of aquarium hobbyists. Once fetching $15 per head or more, these corals now go for quite a bit less. If you want a coral that is a hot item, just wait a few months until the new fad kicks in.