youve mentioned a small tank. how big is it and what is the output of your filter? do you have anything thats agitating the surface of the water, be it the filter or an airstone? have you tested the water for ammonia, nitrite, nitratre and ph? if you dont have the kits then most pet stores offer this service. what kind of goldfish? are they common,comet or fancy?

in the meantime do a 50% water change as i suspect one of your fish is weaker and may be having problems getting oxygen. do you also make sure they all get enough to eat?

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