i had 4 x 54 watt with reflector running 9 hours a day and my co2 drop checker is lime green . whats the balance between co2 and light
what size is the tank?
That is a lot of light unless you have a lot of plant sucking down that CO2. Also, if the tank is new, this algae is a common occurrence as the tank cycles (at least it has been for me in many previous tanks) but goes away after the cycle is complete.
Best to siphon out as much as you can and possibly turn back lighting (or run two instead of four bulbs until things clear up).