the stomach contents of blennies in the wild is mostly detritus, some meaty items such as tiny inverts, and a small percentage of film algae. blennies in the aquarium will eat algae thinking it will be mixed with detritus and tiny inverts. this is why blennies often starve in our tanks. this is why it is important to get a blenny eating meaty items such as mysis and formula one small 1mm pellets (the red ones). live black worms would probably work here too.