Hi! I read everywhere that you should NEVER keep slim bodied goldfish with fancies. I keep fancy goldfish but I recently fell in love with a pair of old shubunkins at my local pet store that were up for adoption. Someone who worked there said they outgrew their tank and I believe they were stunted. I read that the main 2 reasons to keep fancies separate from slim bodied goldfish is that the slim bodied fish will out compete for food and require more room. I keep over 500 gallons of fancy goldfish tanks and ponds. I feed each of my Goldfish individually with gel food and a spoon. All of my setups are very understocked. I also read that they will chase the fancies. The fish that I fell in love with are females and small ones at that. Another is temperature difference, I keep my tanks at 72 degrees so I understand if this is warm for slim bodied goldfish. I know this is a shot in the dark and kind of silly. And lastly if I were to do this I'd keep them with my tough imported Ryukins in a 170 gal. But I'd like to hear what you guys have to say.