What do blennys eat?

Depends on the kind of blennie. Most will eat regular fish food, either flake or pellet. Many graze on algaes as well.

A pic would help.
 
They LOVE fresh clams if he is being picky start them on this since ts nutritious and close to their natural diet, you can do on the half shell but I find its hard for them to eat so I finely chop it and than throw t in a little at a time
 
Might be a black sailfin blenny. I've got one. He eats mysis shrimp and flakes sometimes but his main diet is the algae on the rock work. Nightcrawler constantly eats. Probably hardest working fish in my tank.
 
I just read that seaweed blennies Locke algae and most prepared foods for algae eaters. I have two blennies and they both eat algae and mysis and flakes and brine shrimp. They are very enthusiastic eaters. You don't normally see sea weed blennies so you got a special fish.
 
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