Deformed Guppy Fry

[catherine896]

Have about 5-6 guppy fry free swimming in the tank, noticed that 1 of them is deformed, its back in the middle is arched inwards. Hes like a V shape but obviously not that 'bent' if that makes sense, just a slight curve to him. It also is not growing, it eats like a pig but seems to be staying the same size, where as all the others are growing. He swims just fine even though he always is swimming about near the top.
I havent got the heart to euthanize it I find him really cute!! Ive grown quite attached to him!!! What will it do if he doesnt grow? I mean he cant exactly stay baby sized forever, there is no chance I could kill it and I wont let my partner do it either. Will he survive and lead a normal guppy life if he does grow to adult size considering he can swim and eats fine?
I cant get a picture, he would just like a dot and thats if I can even get him to stay still long enough for the picture to take!

 

[Betta91]

How big is he compared to the other fish? Has he gotten any color yet? Some guppies have an arched back, but it's usually only slight. If he seems to be ok, I don't see a reason to euthanize him. If he ever does happen to grow, he could have other problems as he gets older. For now, just keep an eye on him. He might be the runt of the group and grow up to be a smaller fish. Now if he starts showing signs of complications, you might have to euthanize him then...