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Hello! I'm excited to be part of this family. I mostly in need of help raising my goldfish babies since there's not a visible community of goldfish hobbyist in my area. My fish fam consist of 2 red cap oranda (Pula and Kami), 2 sakura ranchu (Chuchu and Lychee), 1 black oranda (Kujo), and 1 calico oranda (Strawberry). They live in a 75 gal tank. My main concern is that my red cap orandas love to swim on the surface of the water. They're not gasping for air, they just simply float on the top sort of playing god-like and watching the other fish swim below them. They only do this when I'm not watching them! So I've observed this for a month now and they still do it. Whenever they see me and when I come closer to the tank, they swim back down with the rest of the fish fam. I also don't think it's a swim bladder problem because they're not swimming upside down. They also perfectly swim fine when they join the others closer to the substrate. Is this a common behavior? if not, then why does this happen?