Genetically, if he's pure black, he must not be a sexlink but a full blooded Black Ameraucana. I tried really hard to keep them separate, but maybe he got mixed in with the sexlinks as a chick. If he crosses with the others, she will get blue egg layers from the blue eggs, and olive eggers from the dark eggs (Welsummers).
I don't know if it's completely black or not, but you only get curved tail feathers on a Roo, right?
My hubby bought black hose and coiled it around to heat the water in the pool. He had to cut some trees down so the sun could heat it up. Unfortunately we lost our pool 2 years ago with the harsh winter we had, all the ice and snow broke the pool. Now we have a koi pond set up where the pool was. The Earth has tilted so much much it has me worried. The sun is a lot stronger than it has been in the past.
Don't worry, when we look back at the data, the earth has natural warming and cooling cycles, but they last over a hundred years, so it's hard to see they are normal in one's lifetime.