Those are Blasto merletti's, I have had that colony for about two years. They have bright lime green centers w/ yellow mouths. They skirts are a little tan-ish. The white balance needs to be adjusted on the camera, just haven't had alot of time to play lately.
Merlettis lay kind of flat and will almost shrivel up like they are dead when they get distressed. Then they'll puff back out. They are fun to feed as they will capture food and close in around it, giving them a tall, closed look.
