Bicolor Blenny damaging Frogspawn

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". :cry:
 
They start out cute and can become destructive over time. They're difficult to get out too b/c they live in the rockwork. I have never had one, but am aware of their behavior.

Sharon
 
My bicolor knocks everything single thing over - sitting on them, but doesn't rip at soft corals. He likes the very tips of blanched brocolli so i add a little to the mysis when i feed. You might try some greens, just in case his behavior being caused by a diet problem.
 
My Bleeny says away from the new Fragspawn, but my GSM Clown keps nudging it and it won't attach to the LR. So far nothing else will go near it, even the Arrowhead Crab who eats everything.
 
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