Viejas will also eat the plants and so will chocolates. The only plant i had success with was a java fern because they dont like the taste of the plant but you cant expect them not to grab them out of the substrate from time to time. I also had a bunch of floating moss i think it was and they would eat that before my amazon swords and i would just keep buying it so they would eat that instead. Ive seen severums in a 210g planted. Doing well without the plants eaten but on most cases they will snack.