hello Armadillo
my heart breaks for you... loss and sadness is such a horrible thing to endure, and it doesnt matter if its a fish or a dog or a cat. We do love and get attached to our pets and especially the little ones, our fish that cannot take care of themselves and depend on us to support them.
You DID the right thing... remember that. It was out of love that you did not want the molly to suffer anymore. Its a hard choice to make.. but in the end, after the sadness has passed you will know in your heart that you did the right thing and that lil molly would have just suffered more til its end anyway. You spared it a life of misery and pain, as Im sure her scolioses was painful.
take heart...that you were wise enough to know what needed to be done humanly and had the courage to follow through.

~ kate