The male of my 3 year old tapajos red head breeding pair is pretty dedicated to uprooting plants, so I have to keep any in that tank pretty well anchored if I don't want to be replanting them every other day. He didn't start doing that until after they were producing fry. Otherwise I haven't seen geos be a particular problem with plants. If nothing else, it seems you can get the occasional individual that will bother your plants.