Yea, the AquaStik stuff is safe to use and should not cause a cycle. I would suggest you do try to epoxy at least the bigger stuff to something bigger below it if possible. I would say to also try to stabilize any of the smaller pieces that you can move easily (say with the push of a finger) because the smaller stuff is usually the easiest stuff for turbos to push around. Believe me, when they want to get to a certain spot, they will push almost anything out of their way unless it's secured.
agreed! you'd be surprised where turbos end up. I had a couple in my frag tank and those things would end up in the sump somehow. snails in general can travel if they really want to. no fear in those little creatures. haha