Aug 29, 2012 #1 A AdamShea Aquarium Advice Apprentice Joined Aug 28, 2012 Messages 27 How big does a tank need to be for a red tail black shark?
Aug 29, 2012 #2 absolutangel04 Daphnia are People Too. Joined Jun 30, 2011 Messages 8,885 Location Lincoln, NE IMO, 75g. Rainbow sharks would be ok in a 55g.