>Yes, pleeeeease. How does he carpet his gravel with E. tennellus and >Glostostigma, anyways? Good conditions including proper lighting, adequate CO2 and lack of competing plants. I can't comment on the benefits of his particular fertilizers, but I can tell you one thing that is NOT needed: undergravel heating! He doesn't use it. Neil Frank Aquatic Gardeners Association Raleigh, NC