My Bicolor Blenny is rippig off the tips of some frogspawn that I have in my tank, I have two seperate pieces, one was a 4 head(down to 3), the other has aout 7-8 heads. While I was away my wife informed me that one of the heads were white, didn't think much about it till I came back and found one head dead, the other 3 were fine. I did a water change a couple of days ago and noticed the bigger FS was not expanding as much as usual, while watching the tank, I caught the blenny biting off the tips and spitting them out. Thesmaller head was near his "hole where he goes to after lights out, the other 2 heads were now near the hole where he hangs out during the day so I finally put two and two together. Anyone ever witnessed or know what causes this type of behavior. He acts like he doesn't want something that close to his "territory". 