Critter ID please

[JBAqua]

Thanks so much for the prompt reply. It looks like a really cool creature. Too bad they eat only one thing. But I guess if it's something expensive that they eat, I won't want them doing that. As this is a new tank, I don't have anything in there so far except 3 mollies, 2 hermit crabs, 1 nassarius snail and 3 adult cerith snails (and baby cerith snails), so nothing's at risk at the moment... nor will there be food for it, I guess.

I snapped that photo last night when I spotted the nudibranch. I'll try to get a clearer picture to post next time I see it.

Size: 1.2 cm long x 0.2 cm wide (approx.)