Hi there! >cartoon dinosaur paw print (how's THAT for a visual aid :) ) My water is >soft and acid, and they are under 2.5 watts per gallon at 6700k. Who knows >which of these elements might determine lobe count? Anybody? only light. I had the same behaviour and when I put Marsilea under 2w/l , I obtained only one lobe count or two. Ciao!:) Luca