yep from all that i read you are right they only morph to blue when spawning hence the name in latin.Funny fish. In nature blue is the norm (hence the name - Labidochromis caeruleus) but in the aquarium trade it's the yellow form you commonly see.
wow ! you are lucky.:drool: i have never seen them before saturday. whats the price up there for them. i got a deal from a friend who is downsizing. the guy at my lfs almost promised me his 1st born for some fry if they spawn:grinyes:Actually that's partly true, as there are no blue labs, only a morph with blue fins, like the white nkata bay labs with blue fins and yellow kakusa labs with a blue dorsal (is how it's got its latin name).
Nice looking fish DISCIPLE, we get the nkata bay labs in our lfs from time to time.