Please! Stop testing and start dosing nitrates, phosphates, potassium and traces according to a simple scheme like EI. Green Spot algae is aggravated by too little phosphate, not too much. And pH isn't important. If you are concerned about having too low a pH, just add a bit of bicarbonate of soda to raise the KH to around 3 degrees. Then add enough CO2 by slowly increasing the bubble rate and watching the plants, fish and algae. Take it slowly by raising it only every few days. If the fish ever show signs that they are bothered by the CO2, back off a bit and leave it there. Otherwise, raise it until BBA no longer starts back up after you get rid of all that is in the tank. If you only have staghorn and not BBA, again, remove what is in the tank and raise the CO2 until you don't see any more starting up. This took me a month before I felt I had reached a good level of CO2, so don't expect quick results. The way to remove algae depends on what kind it is, but trimming infested leaves, removing and bleach treating stones and driftwood, is one way. You can trim off the infested leaves of crypts too, they will grow back pretty quickly from the rooted crown.