So ive seen big feather dusters in stores but i was wondering if what i have are feather dusters. They look like tiny ones. Theres red ones, orange ones and white and black ones. Ive noticed some of the white and black ones in the sand and the red and orange ones are in little tube looking things on a couple of my rocks. The colored ones suck themselves into the tubes if something goes near them. I couldnt get good pics because their so tiny. Are these tiny feather dusters or something else? Are they going to get bigger?