Hey there. I keep silver dollars in a heavily planted tank. They definitely chow down on a lot of plant life, but fortunately the plants grow faster than they get eaten and I'm still winning the battle at this point. They really munch the Amazon swords and valisneria to smithereens. They're also pretty fond of rotala. Don't even attempt to keep cabomba with silver dollars - it's nothing more than a pricey snack, gone within a day or so. The plants they seem to leave alone are microsorium (java fern) and cardamine lyrata. They're not too hard on the anubias, either. If you've got well established plants and good growing conditions, you can stay ahead of the dollars, but if you're trying to get little tiny plants established in a tank with them, it's going to be a struggle. Feed them lots of spirulina flakes and/or wafers, as well as a variety of fresh vegetables; this helps.