Last year late, the first week of NOvember I had a random spawn. I took 2 water hyacinths out of the pond to try and grow out some babies to look at color development. After the first week I decided with my 60 hour plus work week it was a bad idea because I could not keep up with water changes. I threw them in the green goldfish pond kind of a survival of the smartest. I caught them all when I cleaned out the pond today and noticed that some have a line of darkness that runs down their spine. Does anyone know if this goes away or gets bigger as they grow. These are cheap random spawns I will end up giving away in the end.