A 20 long is low enough to function like my tanks, I figure. I get great growth from rotala, riccia, java moss and ferns and some crypts. I usually just have 2 strip lights over the tanks or position them so they get some natural light. However, I don't mess with anything other than a sponge filter, have low bioloads, and usually have potting soil under a gravel overlayer, so it's quite a different set up than you are talking about. I'm very much the low-tech person (wink). And I probably have snails and either utricularia (which I consider a pest) or hair algae (low volumes controlled by red cherry shrimp) so you may not be interested in plants from my tanks although I'm happy to share (smile). Betty Goetz _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member