According to the wise ones at Tropica <A HREF="http://www.tropica.dk/">Tropica Aquarium Plants</A> Hygrophila difformis, Hygrophila polysperma, Caratophyllum, Sagittaria, Echinodorus bleheri, Ceratopteris and Vallisneria are all *good anti-algae plants* Any obervations on this please? David Napierkowski Focaipoint at aol_com Annapolis, Maryland