Sick vs injured

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NurseJay

Aquarium Advice Apprentice
Joined
Aug 31, 2014
Messages
11
Location
Las Vegas,NV
My tank is a 55 gallon long tank that is home to 2 black moor goldfish. parameters of the tank are as follows;
temp 71
ph 8.2
kh 120
gh 150
nitrite 0
nitrate 20
25% water changes are preformed weekly

The tank has been up and running for about 2 months not counting tank cycling. Before that I had them in a 36 gallon. I have never had any problems with my moors until yesterday I noticed that one of my fish has what appears to be (a total newbie) to look like wounds/scrapes? The only thing I can think of that would inflict this type of wound was a fake decoration that looks similar to this one

All Living Things® Mushroom Tree Trunk Reptile Ornament | Habitat Decor | PetSmart

Before I start jumping to conclusions and add anything to my water I would like to know if I have an infection on my hands or if my inital thought of a wound from decor is most likely.

Thanks
 
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