I have them from when I bought my tank, even he doesnt know what they are. They kind of look like very colorful rock flower anemones but not really, they also have multiple mouths and small tentacles all over. I have bright flourescent green and orange ones (one of the best orange and green that I have ever seen) They have more than doubled in size from 5 months ago. They are active feeders, just like an anemone.

