Do zebra danios eat algae?

I noticed some grey-green stuff on the suckers of my heater, which I'm guessing was algae, but now it's mostly gone. Could my fish have been nibbling at it?

 

I have never seen my zebras eat the algae that my tank had when it was still new?

I guess it's possible, I mean zebras are very active and different personalites, one of my zebras eat my pleco's food from the bottom, and none of my other zebras do that, do I guess ? LoL

 

did you put any chemicals in your water or change anything?

 

mine eat the algae tablets to so maby they do eat algae

 

anything's possible, I mean, mine eat everything except for tubifex worms ?? weird I know. but they eat algae discs too, but have never touched actual algae.

 

I don't think they do. I have never read that anywhere.