Problem with black algae

[JackBlasto]

I have a 100 gallon planted tank. 4 watts per gallon of T5 light and pressurized CO2. I am currently using the PPS Pro method of fertilizing it Our PPS-Pro Fertilizer Pack … Just Mix & Dose | Planted Aquarium Blog – Green Leaf Aquariums

and dosing according to the tank size which breaks down to be... 10 ML of each mix daily.

HOWEVER I have this black algae starting in the tank so my question is what do I do to start troubleshooting?

Decrease the dose? Increase the dose? Eliminate the method?

Thanks for any help.

 

[mohican]

Depending on your plant stock, heavy or light, decrease your lighting if possible. Since your running co2, what pH do you keep? I have 125 and keep my pH at 6.5 and still get some on driftwood but not to bad.

 

[JackBlasto]

PH is 6.3... heavy planted... carpeting plants and some crypts. Lights were on 8 1/2 hours... Going to decrease to 7 1/2 and hope.