The black dots could be a small water bug and i cant remember its name but i had a white goldfish with two black dots on its side and when i lokked to see what it was, i was suprised to see a small transparent bug with two black suckers clinging two my fish it was only about 5mm across.
its worth a closer look and give them a poke but they are hard to get off
thats all i can think of
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