SM i have just thought i another thing about a week before i added the carbon i changed my screen sized from gallons to feeding size this halved my screen size as i dont have many fish in my 90g. Before i done this my old screen kept growing yellow algae now my new screen is growing green hair with smaller screen and bulbs maybe my pump was not strong enough for the bigger screen and bulbs. My point being maybe the growth of green hair algae in a smaller screen is more powerul than yellow on a much larger screen and thats what cured my algae in DT not the carbon?
Possible. Green photosynthesizes (filters) much more, because chlorophyll does the filtering, and it is green.
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