About 10 days ago the rocks in my new tank started turning green. Tank is 2 months old. When I say green, I mean the brightest green you could imagine. This happened right after the diatom bloom. Water parameters stable the whole time. Just today I am noting dots of purple. I have read coralline algae can do this, but it is incredible to watch! Thought I would share as a new reefer after spending a lot of time researching the “problem” over the last week. Thankfully reef2reef prevented me from adding something unnecessary for nuisance algae that might have set me back. Great community here!