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Discussion Starter · #1 ·
Hi everyone,

I'm wondering why as my plants grow, the older growth turns dark brown but the new growth is light green. I want to reduce or eliminate the amount of dark brown growth from my plants. I am currently running a CO2 system at about 1.5 bps and I have a Beamworks DA FSPEC light 10000K, Actinic 460nm, Red 620nm, and Green 520nm spectrum LEDs. My light is on for 9 hours a day, although I have also tried 8 hours and 10 hours. I have also tried to adjust the distance of the light from the tank, but I haven't noticed much of a difference. I am also adding flourish comprehensive plant supplement and doing water changes regularly. Does anyone have any recommendations on how to prevent the brown spots on the older plant growth? If this is not the result of nutrient deficiency is it from algae blooms? If this is from algae, what can I do to prevent it?
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Discussion Starter · #3 ·
My baseline water is at 7.6 pH degassed and at 6.4 pH when running CO2 in the tank. The size of my tank is 65 gallons and my light is 25 inches from the substrate, although I have previously tried at 18 inches from the substrate.
 
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