Your anemone appears to be an Atlantic Sun Carpet anemone (Stichodactyla helianthus). The identifying characteristic would be brownish/orange spots on the under surface of the anemone. If this is the case, then the good news is, it is relatively hardy as far as anemones go. The bad news is that they do not host clownfish in the wild and in fact have been known to eat clowns that attempt to use them as hosts.
I am not sure what you meant by, "i switched lights to an iradescent", but anemones need a lot more light than fish. If you have a standard 20 gal tank, you should have the equivalent of 4 - 24watt HO T5 bulbs over the tank to give any clownfish hosting anemone enough light for its zooxanthellae to do enough photosynthesis to survive.