here is what i do. it might not be safe for your vals or other excel sensitve plants.
the directions on the bottle say that on the first dose or after a major water change to use 5ml for every 10 gallons of water (for you it would be about 20ml). i double that (40ml for you). now the catch, do a 50% water change. when the tank is half full, dose the 40ml. give it about 5-10 minutes and then fill the tank. every day after dose 20ml. should take a week or less before you're algae free
the directions on the bottle say that on the first dose or after a major water change to use 5ml for every 10 gallons of water (for you it would be about 20ml). i double that (40ml for you). now the catch, do a 50% water change. when the tank is half full, dose the 40ml. give it about 5-10 minutes and then fill the tank. every day after dose 20ml. should take a week or less before you're algae free