Black spots inside Sulfur Denitrator?

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Exus

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I noticed that there are a couple of black spots on the sulfur pellets. I'm guessing that it's a bad thing, maybe deadspots? Is it a concern if it's just a few spots? No egg smell from the affluent.

I'm using a Georeef sulfur denitrator, it has a recirculating pump.

This reactor has been running for maybe 5-6 months now. My versa doser is running at 100ml/min. My nitrates are stable at 10-11ppm.

The affluent coming out of the reactor tested at 2.0ppm Nitrate today. About 2 months ago when I last tested, it was at 0.3ppm Nitrate.

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