I keep reading seachem excel can kill off certain algae with overdosing or spot treatment. Going to document my results here. I think this is black spot algae. If not, someone please correct me. Not the greatest pic but here it is. Links to this tank in my sig.
Awesome, that looks much better. Did you do anything besides dose Excel? How did you dose?
Spot dosing with a syringe when 50% of the water is out during water change day. I try not to use more than 5 ml for the entire tank (6 gallons), which I drop over several leaves. I don't think I did anything else different. The tank could just be getting better with age. I continue to do 50% water changes weekly along with EI dosing.