Bicolored blenny that ate sps, esp. cats paw, eydouxi and bites clam mantles. Easy to catch with a hollow barnacle. Won't have another of those or yellow clown goby.

They look harmless enough, but, a male from a mated pair of yellow clown gobies kills areas of coral to nest in with his hormone slime and both male and female eat sps polyps.

Nassaius vibex snails: Fish food settles around a clam or another snail dies near the hinge of the clam and these little devils think they can get to it through the clam. Then they fall in while climbing on the shell, clam closes and opens when its dead. They seem to learn to kill clams this way and it seems as if it becomes a sport. No more Nassarius vibex for my tanks with clams. The other species of N. in the same tank don't to do this at all. Had them together for several months then lost 6 healthy beautiful blue teardrop clams to the same method within a couple days.

CBB with smaller clams on the sand bed. (Move the clam off the sand into the rocks, at least till the CBB is trained.)

(Large brittle stars are always noted predators in a reef, btw as are any species that grew larger than expected. One member has a sally light foot that is larger than my hand with fingers spread wide! He'll steal lunch for you; That thing is big enough to be lunch!)