i have a black sailfin algae blennie that i have to catch in my 120G reef. after about 2 years of model citizenship, he suddenly started biting at my squamosa clam; which was just added a couple months ago, and hadn't been opening fully lately. finally last week i saw it happen twice. he just swam up, and chomped the clam right in the middle of the mantle. the clam withdrew, of course, and only slowly began to re-open. then several hours later, i witnessed it again. so, i put one of those mesh cages over it, the ones made for keeping fry in the tank without being eaten. the clam just barely fits and can't expand fully in the net either. so, i really need to get that blennie out of there, but he is pretty swift, and hides as soon as he sees the nets. i've had the nets dangling in the water for a few days now, in hopes that he'll get used to them, but he's still very cautious. any ideas? i considered giving him another chance, now that the clam has been protected for several days, and see what happened, but i don't think i could trust him again, even though he's lived with two other clams for over a year now. i guess, like they say, no fish is "reef-safe".