Richard, How many pair of gardneri do you have in that 20 gal tank? And is it a tall or long tank? Ed Brandt Fabius, NY Join the AKA at http://aka.org/modules/tinycontent0/index.php?id=9 Archives are at http://fins.actwin.com/killietalk/ Modify your subscription at http://www.actwin.com/mailman/listinfo.cgi/killietalk