The reality of how much nitrates are consumed by the algae I would think is minimal. But would still show something on a test. But they could be being fed my other things, but I think the white spectrum has alot to do with it.@motortrendz Don't you think the 0 nitrate is because his algae is eating it?
Also not relevant to your current issue but ditch the hydrometer and get a proper refractometer even a cheap one from amazon with calibration fluid, will save you salinity issues in the future.
I'd say go easy and simple again, weekly water changes, scrub the rocks, get some CUC as suggested by others and make sure your RODI is 0 TDS (ask your LFS to test it for you if you don't have a TDS meter). Overall you're on good tracks, you'll find good advice here and you're willing to listen so patience is key!
TDS total dissolved solids... a measurement we take at our rodi units to ensure the filters are running optimally, running 0 tds out of the unit is what you want to see. Anything else would mean dissolved solids are being put into your tank and your filters need to be replaced.

