I don't have to frag that stuff... it does it for me! That started out as 3 x 3inch piece in December now I have a 1 x 3 inch one left on my rock and that piece I took in was 9 x 8 inch ish........ Like I said they are a weed. They took over my "zoa rock" in my 24g. They are in a place they can't do much!