This customer's HOG3 or 3x or 3xx is overly packed with a very light color of green hair algae. The middle (at the bottom) is more green, because it is getting more nurients (iron in this case) delivered to it by the upflowing bubbles. But the sides are getting less bubbles, and thus less iron, and stay yellow just like a plant that needs fertilizer. Thick growth like this makes it harder for bubbles to reach all areas of the growth.
So this could be done:
Harvest more often so it does not get as thick, which blocks nutrient flow.
Increase bubbles to deliver more nutrients.
Reduce hours of light.
Feed more, especially more iron in nori, etc.
Add a second scrubber, so each one takes longer to get thick, and clean them alternately.
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