rock flower anenomes, brain corals, bubbles all need moderate lighting. Some of your leathers do too and even the star polyps. many polyps like zooanthella (zoos) can do with low quite nicely depending on the type.
...not 100% sure of a flower anenome to tell you teh truth, but there are many different names for many different corals...
The spounge and feather dusters are not true corals. Feather dusters are tube worms, related to bristle worms. There is a whoe archived thread about them in the reef section right now. They can go in a tank without any lighting, yet they are not a coral.
a disk anenome is not a TRUE anenome, it is another name for a mushroom coral. These are some of my favorites ever and they are pretty inexpensive depending on the mushroom, spread quickly, and can go under lower lighting situations.
good luck!! you have a 30 gallon tank.... how high is that? Just trying to figure out how much lighting would be good for your system if you are looking to keep low-moderately lighting corals.