Does chaeto turn rock green?

[bjj_junkie]

Hello, I'm still pretty new to this and I added chaeto to my refugium about a week ago and I noticed first the rocks in the refugium turning green which was odd cause I didn't see any type of algae in there during the whole cycle which ended about a week ago. But now I see the same green color on my rock in the display. Is this from the chaeto or is this a different type of algae?.. Everything is at 0 nitrates are close to zero but my ph is kinda low, about 8.10 in the day and all the way down to 7.50 at night. Last week I ordered a clean up crew and took advantage of the free shipping and got a few chromis and they're all doing fine. Ill add some pics to help.

 

[mr_X]

That's a different type of algae.

 

[bjj_junkie]

Do I let it be or take some kind of action?

 

[mr_X]

I would wait and see right now. If you don't have photosynthetic creatures in the tank yet i would use the lights reasonably, and start a water change regimen.