abcmom

I have a male guppy that is acting strangely. His tail is clamped and he wobbles from side to side while hovering and swimming. There is another male and two females in the tank with him. The rest are fine and the tank is a ten gallon capacity. Can't see any ick or fungus, breathing is normal and he is eating very well. He is not hiding or staying alone at all. Temperature is good, the tank is cleaned regularly and treated with conditioner etc. Anybody have any clue as to what might be going on?
P.S. A batch of fry were born on Feb. 18th. They are fine and in a breeder tank floating inside the main tank.

newbie101

What are your ammonia/nitrite/nitrate readings?
And welcome to Fishlore!