he (as far as I know) is a hummelincki...they dont get much larger making it an excellent choice for my small 28 gallon. I wouldn't recomend going any smaller, however he has lots of places to hide and room to "jog" around the glass during dinner time. Im setting up another 29 right now to move all the coral into, because he just loves to play with the frags and move them around too much.