They eat two different plants in my tank. One is Glossostigma (sp?) and the other is a type of sword plant with really thin leaves and shoots off in runners. I'd post a pic if I could, but yea, they definitely are the only ones that devour plants in my 90 gallon planted tetra tank.
interesting. I have a ton of crypts and anubias in with mine and they don't seem to touch them at all.Water wistira, jungal vals, anubus, crypts.. I could make quite a list of what mine ate.
Might vary by the individual tetras involved...have you tried giving them some vegetables in their diet? That may help.