Your pudgy ones are Fantails, Other one might be koi. Please stop feeding them three times a day, will not be good for them. Remember, what goes in comes out and they will be swimmin in their own waste, even with good filtration. Ours eat twice a week, sometimes three times a week. A fish dealer that had tons of tanks of beautiful fish said, too much food and they be swimming in their own waste. We have had fish for many, many years. Tank Goldies and pond Goldies. We do not even feed the pond fish in the summer, they eat whatever gets in the pond. Skeeter larvae, tadpoles, etc. about a 50 gallon pond. Once in awhile I toss in some bread crumbs if I am sitting there eating a sammich, otherwise they forage. Go online and search for feeding Goldfish and get some tips.