Yeah, I have a ton of them. I started out with probably 80, and have no idea how many I have now. I think I had a worm that ate a few, and probably hermits got some too. From what I have seen in my tank, the smaller ones tend to spend a lot of time on the glass eating algae. they are known for eating detritus, but I suspected that they do that more as they get older. I had a couple of the BIG tonga nassarius and they were eating the smaller, regular nassarius...so they had to go.