Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
1) Improve light, CO2, nutrition for the plant to grow better.
2) Hand remove all possible algae.
3) Wait for it to come back, and treat.
Here is one way with a few variations:
Hydrogen Peroxide (the 3% version that is commonly sold): 1ml/gallon of tank size is generally safe. You could try 1.5ml/gal, but that can be risky. I would not use this much with delicate plants or fish.
Excel: Use the 'loading dose' as the max unless you have plants that cannot handle it. Anacharis, Valisneria and a few others can only handle the regular dose as a max.
Figure out the maximum dose of one or the other based on your tank size.
Put that much in a syringe (no needle) or eye dropper.
Turn off all the equipment.
Squirt a little bit into each mass of algae. You might or might not get around to all of it before you run out of product. That is OK, treat the next areas tomorrow.
Wait half an hour, then turn on the pumps, bubblers, power heads.
Next day: Do at least 25% water change, more is better.
Repeat the treatment.
You can continue treating, always remembering to do a water change between every treatment. You could alternate the treatments, again, 25% minimum water change and 24 hours between treatments.