I can tell you for a fact they will Jake. OF the few times I did see the Polleni in my 100 get it on with something outside of their own, it was the Tilapia Bythobates I have, which are from Mozambique. It wasn't a constant battle all the time, and again we're talking 3-4 inch size range on the Polleni after 6 months of having them, occasionally they would fight them, but not constant on end fighting.