Hi, the white one its an oranda red cap and the other one its a comet, for the look of the comet i would say its one year or older, they will grow acording to the fish tank size
the single Tail is a japanese strain known as a Sarasa Comet. usually the Blood orange coloring stays above the lateral line and the rest of the fish is a pearly whit but theres always a couple of oddballs in a brood.