single tailed type goldfish - shubkins and comets. double tailed type goldfish - oranda, ryukin, pearlscale, telescope, demekin, pompom, veiltail, and black moors. double tail with egg shaped body - bubble eye, phoenix eggfish, celestial, lionhead. Each type should only be kept with other goldfish of the same type. i.e a bubble eye should not be kept wit ha commet.