Hi, I have just, redone my tank and have made my first attempt at setting up a riccia carpet, by sandwiching the riccia between some plastic griding. For the moment I have weighted the mats down with a couple of stones, My question is, should I allow the riccia mats to float at the surface for a week or so until they get started or, would they establish just aswell on the tank bottom. I have read somewhere that riccia should be floated freely on the tank surface to start it off, and I have also read somewhere that riccia should not be exposed to direct sunlight (does this apply to flurescents also). Please put me right. I will be setting up a tank journal soon, my current setup is a juwel Rio 240, 4 * 54W T5 lamps, pressurised CO2, Laterite + Aqua Medic Terralit + top layer of fine black gravel, I will be dosing Aqua Medic Ferreal + spureal plant fertilizer weekly.