I have kept and bred these fish for many years - I have found that unless they get cucumber on a daily basis they will rasp away at the leaves of some plants, leading to holes and death of leaves. New leaves on sword plants seem to be particularly vulnerable. Slice of cucumber sorts them out.
As with above, I've had juveniles in with plants that have left them alone but they were provided with fresh greens daily. I've got a couple in tanks with some "gash" plants and they have been munching away on them. Wide leaf plants can be targets for most plecos too.