serpae tetras or cardinal tetras
i like cardinals. what would you have them with - could make a difference
serpae's are a bit of fin-nippers so not popular for community tanks whereas cardinals do well in community tanks as they are peaceful.
i have silver hatchets, a betta, rts, gourami, gold nugget, bloof fins, kuhlis
I would move the betta to a tank of its own its well known that they do betta alone. Its not just aggression its due to them being piggies and eating a much food as they can or not getting enough if the other fish are faster. On a different note I see you have 2 oscars in a 55? I believe the reccomended minimum for 2 is around 125gals.
:;dk How many of which fish do you have in which size tanks? Please complete your aquarium info. Members coule give more accurate stocking advice know what fish you're wanting to add to.