He grows restless.
He's resumed speeding around the tank at top speed, with occasional stops to gnaw on the food pellet or frantically move some random rock.
He's also started dive bombing the others. He'll just be speeding along, and then DIVE, detour straight at another triops and throw him onto his back. I've only seen him attempt to gnaw on one of them (one that swam into his path), but that one managed to escape under the rocks fairly easily. Even the largest of the smaller ones are only about 3/4 the size of the bastard. Luckily for them, they seem to be fairly good at staying out of his way.
He's about half an inch now. The others are just starting to reach centimeter size. Someone appears to be much better at getting the food than the others.
The aquabatics are really quite amazing. He does all these little loops and rolls and spins. I need to stop forgetting my digital camera already.
I still need names for the others. I'm thinking of naming them after different types of food.