Tank is a month and half old, going through the ugly phase but also noticed this green little patch and a couple other small patches like it in 2 other places on my rock. Any idea what it could be and if it's concerning. I know the diatoms are not a big deal I have just introduced a clean up crew consisting of 20 Dwarf ceriths, 9 Florida ceriths, 6 astreas, and 7 nassarius per the recommendation from reef cleaners.