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Is something wrong with my fishes?? They are going to the surface to get air. It just happened today. In my 10 gal tank. Water parameter are normal. Air pump in. 2 live plants. 1 fake plant. 1 hiding place. 1glass dolphin.
Goldfish like colder water, so that's probably why they are at the surface. They need LOTS of oxygen. If you have another tank, I would put the cories in it. They like warmer water.