Tilapia discoloring sign of sickness?

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Just noticed one (out of 100) of my blue tilapia is now much darker at the back 1/3 tail-end of his body. Growing and eating fine. They are approximately 1 month old and in a 500 gallon tank. Is this a sign of disease? 



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If they are growing and eating well I wouldn't be too concerned, but keep an eye on them. What are your water parameters like, ammonia, nitrites, PH? Anything that could be stressing them? Remember many pathogens can be there but not effect the fish until they are stressed. 

Sometimes you just have a few fish that have issues while the rest are fine. 

Edited by Cecil (see edit history)

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