In theory, they are supposed to eat hair algae.. reality is, more seem to get quickly trained to eating food you put in the tank vs eat algae. When first introduced they seem to do ok with algae for a month or 2, but most of the ones I have had stop eating algae on the rocks after they realize I feed the tank daily.
I see those come up often on Divers Den.. problem is you have to pay $45 shipping on a $40-$50 fish.
So true.
Different type of Blenny, but similar eating style... I put an Algae Blenny in my tank early on. Would only touch algae. Finally got him to touch dried algae when I tried Nori (cheaper then the LFS stuff and the fish like it better). Added a Starry Blenny in. He wouldn't touch algae. Doesn't even care much for Nori. Loves anything flake. Now after months of throwing a tantrum and trying to figure out what the Starry Blenny was eating he finally figured it out, flakes are food. He has also recently figured out chopped up shrimp is food. Haven't seen him picking at the rocks/glass since (although he still goes nuts for Nori). :rofl:
It seems it isn't so much that they prefer algae, just that they don't always recognize everything else as food.