they wont bother java moss or java fern to much. anubias can take a pretty hard hit too, or you could get a fast growing plant like anacharis, duck weed, or horn wort. i have a val planted with my dempseys and its growing pretty well and they never really even noticed it. hope this helps
I keep anubia with my convicts,...they beat them but but never really harm more than a tear or two, java moss, crystal wort (floating) hornwort, guppy grass, and tiger hygro.