Hey all, waiting on a second flush to appear but there are some black spots on the surface of my sub that look odd. The spots don’t seem to be growing in size, but definitely don’t seem to be the same color as the sub I used so I’m a little concerned/curious.

The original sub I used was more brown than black; but I did just pull about 1,000 wet grams from the first flush about 5 days ago, so maybe the giant monsters depleted all the nutrients in the places that are black?

Does this look like contam; or just sub that now lacks nutrients? Last pic is the giant flush that I THINK could have caused this… but you may notice they had a ring of no growth in the center of the tub…🤷‍♂️

You’ll see in the first few pics that’s I AM getting some new pins but not in the black spots 🤔

Never had experience with contam; any and all guides or guidance provided is appreciated greatly, even if this isn’t contam!