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Have you got an HOB filter, if so, that's the trouble.
An HOB disturbs the water too much to run CO2 with it, causing the CO2 to gas off. The air curtain would also drive off the gas.
A lot of times an algae outbreak can be traced to a fert imbalance.
Read up on the Estimative Index method of fertilizing on Tom Barr's site. I use Chuck's Calculator to dose my tank. You don't show a nitrAte level, what's it at? How about phosphates? Those are the two big contributors to algae trouble.
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