I'm not using gas CO2 atm, my lights are on for 7 hours. On at 3pm and off at 10, I would cut them back an hour or so.
Use the liquid carbon regularly as it contains an algaeacide which is useful. It's good that in the poor flow areas are the worse affected, at least you can identify the problem then
Be sure to feed the plants if you want them to grow healthy... especially if you are adding extra iron - not doing so is a recipe for disaster regarding algae
