I’ve had the fish for about 2 weeks and he’s in a ten gallon (filtered tank)I couldn't see clearly what you meant (the spot in the middle?), so I edited the photo a bit, but I still don't see it as a problem, maybe the editing will help others to diagnose.
Is the fish new? What size tank, or container?
But agree with Kno4te as a solution. If in one of those little Betta containers, I'd be changing some of its water every day.
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I’ve had him for 2 weeks, he’s in a ten gallon (filtered) and there’s a bristlenose pleco (2.5 inches) and a few shrimp in thereand I’m using caribsea substrate for cichlidsLooks to me that there are more spots in the lightened photo. How long have you had the fish? Whats it in? Anything with it? What type of substrate? Color?