Who is eating my fish???

[fishrookie]

A week ago I lost a cat fish. I wasn't sure if it was a disease or if someone had attacked. Both eyes were missing. I purchased two more because the one that I had left was scrambling to hide everytime I came into the room. My husband thought they were social fish. In less than 24 hours I have now lost the two new catfish. Both had missing eyes. I also purchased 6 neon tetras. Two are left. I feel sick to my stomach. The big fish in the tank are 1 pleco, 1 angel fish, 1 ghost knife...I am suspecting the ghost knife. What do you think? Are my options pretty much limited to NOT getting any other fish at this point?

 

[misterking]

Black ghost knife is almost a definite. They're predatory and should not be housed with small fish such as neons. How big is it? Depending on how big your angel is, it might also be a culprit for eating the neons.

Also, the knifefish will eventually out-grow your tank, reaching roughly 50cm.

 

[Newman]

aside from the knife, I would suspect the intake of a HOB filter...
cover the filter intake with a foam/sponge to eliminate any risk of having the fish getting a body part stuck there...