Michika,
It's only about 2 inches long & it eats mysis (Hikari & PE). There's a pair in there but sometimes they live together in the same tunnel, other times one gets booted out into the doghouse (figuratively speaking). Paid $25 each for pearly jawfish, now found out I could have gotten Indonesian Dusky Jawfish for half that at Coral Ocean
Oh well, these are very beautiful fish so I guess if they survive long term, that's a worthwhile investment.
Anthony