Depends on what kind of fancy goldfish, they can be single tailed (Nymph and Tamasba) or slender bodied double tailed goldfish (Jikin and Wakin). Comet & Common goldfish ain't fancy types.
Sorry, I'm not sure what you mean? OP said moors and other fancy types, where did the comet's and commons come from? I was just saying that with fancies, in this case moors and their ilk, lots of flow wasn't a good idea.
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