This next link is probably your best bet ... very extensive ... you just have to click EACH one to see the picture ... hundreds ... but scroll down to this family ... looks similar SUBORDER DENDRONOTINA > FAMILY Tritoniidae http://www.seaslugforum.net/specieslist.htm
I found 2 instances where the yellow is referenced as Tritoniopsis elegans from Thailand. On the sea slug forum it also states these feed on soft coral. [smilie=sadsmile.gif]