bubble algae on surface

[Lecba]

Hi all, first time posting!

I have a 12 JBJ Nano Cube, been running for about a year. All the testing is normal, but I have been getting a slightly greenish film on the surface about 2 weeks after a water change, and tiny bubble algae on the surface. I bought a RO/DI filter, and have used that for the last two water changes. I havn't added anything new in quite some time. Any idea on battleing this problem?

14 # LR
10 # LS
salinity 1.023
Ca 450
ammonia 0
Nitrate 0
temp 78-80
stock JBJ Nano Cube lights (24W compact?) for 8 hours a day

 

[Max]

If it's really valonia it's probably not really water quality issue. Its has little worms and such that live under it and provide it's nutrients. Are the bubles hard to the touch or are they more like air bubbles under a green algae mat? If it's Valonia removal is the only answer just try real hard not to popp the bubbles or that crap will be all over.
Best of luck
chris