do all blennies eat algae and macros?

Well i stay in india, city bombay and at our rocky beaches, we get these blennies. i would like to know the actual name and also will they eat algae and macro growing in my tank? at LFS, its been a year and still they dont have blennies. these pics are of the local blennies that are found here. my friend has kept them in the tank. it eats all flakes and leftovers. his tank dosnt have any algae coz he has a FO tank.

 

I don't think all blennies eat algae, my lawnmower is spoiled on mysis now. Barely eats any off the rocks.

 

what blenny is this then?

 

Looks like a high fin/algae colormorph, try them out they look cool.

 

they get camouflaged in the rubble substrate. they look kool but just wana know wether they eat algae or no. they are best for keeping the bottom clean. thats what my friend told me.