I have heard of a red snakehead eating a cat the alleged story goes cat used to sit on lid as was nice and hot from the light unit. THe owner who had the lid off to clean tank walks out with bucket of water hears a large splash and commotion. Cat has jumped up to discover no lid snakehead take to bate!! I have heard this story from 2 friends in the trade so could be true could be an old wives tail but cool story. (Not if you are a cat lover)