I had a big cyanobacteria outbreak when my tank was new. I thought that it was because I was using a 6500k light that I made myself (with a GE 26 watt daylight bulb and a desk lamp) ..... it turned out that it had nothing to do with the light temperature. All new tanks have it and once I started to have hairline algae, then the cyanobacteria gradually disappeared. It took about four weeks in total.
side note 1: One thing that I want to warn people about is that you have to do an adjustment for temperature after measuring the salinity --- if the temperature is 77 degrees -- then the adjustment is 0.0023 -- so a measurement of 1.020 becomes 1.022.
This is because hydrometers are designed to work in the range of 68 to 82 degrees Fahrenheit. Some refractometers are calibrated for 75 degrees, so you may not need to do an adjustment.
side note 2: I read that the salinity should be 1.026 if you have coral, I have a mushroom coral that is not doing too well. My salinity is only 1.022, I've been trying to feed it (cyclops) frozen copepods, but I can't see that it eats anything (nothing will stick to the mushroom). Does anybody have any advice for me.