The tank is 2 months old which probably means the ugly phase is starting. These patches might be the first diatoms or dinoflagellates to show up. As those patches are really small you probably won't be able to simply blow them away with a pipette or turkey baster. But as they grow you might be able to tell if they are slimy or dusty and can partially removed this way.
Either way, you most likely won't have to act at all. The ugly phase is totally normal and part of the tank's maturation process.

Don't worry if it turns out to be dinoflagellates or cyanos. In the first few months pretty much all "outbreaks" that would be devastating in an established tanks are very common and expected. Keep nutrient levels low, but detectable and don't add corals until the green hair algae phase which will follow the diatom phase is coming to an end.
If you take a look at
post #16 of my microscopy thread you will see how your substrate might look in a few weeks.