I have 2 in my tank, that one is the biggest. I have seen a few hermit remains here and there but nothing on a large scale I have had the zebras for about 5 months now. The blue legged hermits in the front have been some of the first ones I put in my tank over a year ago. But thats not to say it hasent happened, I just havent seen it, yet. LOL. They are bulldozers though, crashing through anything in their way.