What are my Black Neon Tetras eating off my Hornwort?

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Divis_Julius

Aquarium Advice Apprentice
Joined
Nov 28, 2012
Messages
25
Location
British Columbia
I recently added some hornwort to my aquarium, and initially only my Dwarf Orange Crayfish took interest, claiming it as his new abode, but today my neons are feasting on something. Any idea guys?
 
Many tetras will nibble on growing plant ends of fine leaf stem plants. That is most likely what they are doing. Also bio-film collects on everything and there could be something good in the bio-film on the plant.
 
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