My 50gallon has 3 silver dollars, and they havent bothered some of the plants I have in there. Yet the plants are anubias, java fern and java moss, they do love to mow down hornwart though. If you get thickleaved, waxy like plants I dont think they will bother them. Or add a few plants that they can mow threw, and it will save your more pricy plant species*celebrate