Thanks everyone for the nice replies !
The Scooter Blenny is not really a blenny, he is a dragonet and his diet is more demanding, hopefully they learn that the dead pieces of frozen food floating around is actually food. The ultimate goal is to get them on something nutritious like frozen mysis - I do see mine doing this... they eat pods too, I think they are a bit easier than mandarin dragonets, but still not as easy as most fish.