>> have found them to be even better than some of the tetras as dither fish << What are the attributes of a good dither fish? I've never really addressed this issue personally, but let me throw out some categories as a starter for debate with possible values or options. Some have obvious choices (i.e., aggressive dithers are not desirable) but I'll include them anyway in case what may be obvious to me may not be right at all. :-) ACTIVITY Active swimmer, moderately active or sluggish AGGRESSION aggressive, somewhat aggressive or peaceful STRATA OCCUPIED upper, middle or lower REPRODUCTION Live bearer or egg layer COLOR colorful, moderately colorful or dull Bill Vannerson McHenry, IL USA william_vannerson@ama-assn.org