They are a nice, smooth blue-gray. The largest one is 6 mm, and the smallest ones are about 3 mm. Average size is 4 mm. They like to climb all over each other and eat a LOT. Favorite food is algae wafers and tropical fish flakes! They are poop machines as you can see in one of the pictures where it is trailing on one little guy. And they have the classic blue brig orange spots on their faces and feelers!
Breathing question: do they use their siphons yet? They seem to be happy as long as I have an airline in there. And some have a weird habit of crawling out of the water especially at night (one of the picture has a couple out of the water), and the next morning everyone is back inside. Other than that, everything is normal. Enjoy the pictures!