Half Black Blue Guppy (Trio)A hard water fish in nature and while it may manage in soft and or acidic conditions, long term maintenance should be provided for guppies in moderately hard or harder water. Unfussy, though a planted tank with floating vegetation is appreciated. Strong currents should be avoided. Fish Size Guide: The 'Maximum Size' outlined below is the length this fish can reach as a full grown adult. For the actual size please use the select menu above. Discus. ae