Originally Posted by parkwest
. I haven't added any live rock since the very beginning so I doubt they came from there.
How about coral frags
these kinds of starfish prefer to hang out just under the surface of substrate, on the underside of rocks, so if you got any frags
attached to rocks they could have rode in on that little chunk of rock.
Or... if you do not feed the tank very much.. they could have been there from the start and they have just been reproducing slowly (they populate according to the available food)