Red Patch on Goldfish

Ninak

Hi! A few days ago, I noticed this red injury looking patch on one of my goldfish. Any thoughts as to what it could be? How do I treat it? The goldfish is acting normally - eating regularly and no behavioral changes.

75 gallon tank
Sponge Filter
No Heater - water is 78 degrees
Stocking: 3 goldfish, 7 giant danios
50% water changes bi weekly

Water Stats from API Master Test Kit
Ammonia: 0 ppm
Nitrite: 0 ppm
Nitrate: 10 ppm
pH: 8
 

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jtjgg

i notice there are some sizeable rocks, might have scraped against a sharp jagged part of the rock?
 
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