I was having a problem with it too. Couldn't add another fish, so first got an emerald crab, didn't eat it, then added some more turbos, nope, and now I have a sally lightfoot that IS eating it. I think it's one of those things where if you buy turbos they may or may not, emeralds may or may not etc. I like having what I bought in my tank anyway so I'm glad I bought them. Between my harvesting and the sally lightfoot, the phosguard and a rather large water change mine is almost gone. Good luck