IMHO, yes. I bought the same kind of shrooms from here and 1 was detached and another fell off a few weeks later. I tried super glue gel--nope---learn from me and place it on a rock with something covering/holding it in place (I used what looked like bridal veil, it was left over from my wedding decorations actually). It took me about 3 weeks in a low flow area and finally attached! If you leave it on the sandbed, the current may take it to the back of the rocks (as it did for me) I could see it, but couldnt get it. Just 5 days ago I seen the 2nd one sitting on a front rock (I believe my diamond goby shifted it) I grabbed it, and did the same, so far so good.