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What size tank and how long has it been set up?

I have never seen Goldfish lose scales unless it was from being banged around.

Goldfish get big but Koi get huge, three feet or more is not outrageous for Koi which is why Koi do not end up in tanks especially with Goldfish. For a time, depending upon conditions the Comets will keep pace with the Koi as per size but eventually the Koi can outstrip the Goldfish. Singletails such as Comets can take care of themselves but Fancies are, at times, slow and cumbersome.

I have had Goldfish in higher temps for weeks but 75 seems a bit high as a normal thing. Koi can withstand temp variences as can Goldfish and some folk use salt as a normal additive although I do not.
 

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Koi usually are kept at a rate of one fish per four hundred gallons.

The fish getting banged around in the tank is very possible.
 
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