Its entiely possible for nems to eat fish. It's not the norm but it does happen. Big reason I got rid of mine, I was always worried he'd eat a fish LOL
How big is your tank? Could he be hiding somewhere?
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.