Excel will help control many types of algae. I use it in my heavily planted aquarium in conjunction with pressurized CO2. Are you EI dosing? If so, don't forget the VERY IMPORTATN 50% water change weekly. After the water change dose 1 capful of Excel per 10 gallons (as instructed on the bottle), then dialy dosage following instructions. I have corkscrew val in my aquarium and they are doing just fine with the excel.