pleco has a red fin

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5 skirt tetras 5 black neon tetras 7 red minor tetra 4 kuilhi loaches and 4 ghost shrimp 37 gal I have never seen any of the fish harrass sway-z he's pretty fast
 
Does anyone know what this could be? He's still active as ever and munching on everything. Could he have hurt his fin on a decoration or is it something else?
 
Normally from what i have experianced when a fishes fins or gill area turns red it is ammonia burn it can be cured with doing pwc's frequently to reduce theamount in the water. What sort of water do you ise?
 
Here are the levels on my tank. Even before my weekly 7/8 gallon change.

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Before my water change that I did on monday


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Yesterday
 
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