I've been looking around for some nice plants to put in my tank, but the ones in the pet stores & wal-mart are so expensive compared to how cheap they look. I know that I can find some nice-looking plants at the dollar store that match the decor in my house & compliment Patrick's color, too. However, I don't know if they contain bad chemicals, dyes, or what. Are ones made for aquariums specially treated, or something?