I have kept those before. They are 'common' goldfish. With feeders sometimes you can get lucky and even get sarasa or shubunkin comets or bristols, but you didn't. Commons are great fish anyway, always busy, will follow your finger and can learn to hand feed. If you take good care of them, they will be over a foot long in two years, and hit a maximum size somewhere around 16". They will do fine with higher temps (80+F), but they prefer about 65-75F. Since they are not "fancies", they can be kept with most community fish that are too big for them to eat. If you give then substrate, they will love you for it, they love to play with the sand/pebbles. They need veggies in their diet, like SAs. Also, don't try keeping them with plants, unless you don't mind them getting eaten,