I have several of these growing on one of my rocks. I've haven't added anything to my tank for a long time, except a couple of cleaners, so i don't know where they came from. Sorry the picture isn't better, it's still quite small.
It wouldnt really matter if he ate them, people pick them out f their tank with tweezers because they dont look nice.
Ninja'd means that i beat someone to posting an answer! :p
Well i did have a big one, but it was under a rock, so i didnt care, about an inch long and 1/3 of an inch wide. Just pick it out if your not to keen on it!