Is. This diatoms?

[Juice780]

My tank has been up for 4 weeks and I have been runnnig. My lights for 3 days. I have a hydra hd 26. I’m running acclimation mode. Ives started seeing the tips of my rocks turn brown. I’m assuming it’s diatoms. It’s not on the sand bed at all.

 

[Spare time]

You are getting your first algae on the rocks. This is completely normal. Rocks go through a series of color changes overtime as new types of algae colonize it.

 

[Juice780]

I am assuming it’s the lights because it’s the tops of the rocks that get the most light. None on the sand as of now. I am using the ab+ schedule I found online. I am using the acclimation setting so it’s not full strength.

 

[Juice780]

Anyone else have idea exactly what kind of algae this is?

 

[Bret Brinkmann]

I can't see it well from the pictures but I suspect it is some type of brown film algae. There are a lot of critters that will eat it. So now that you have algae growth you can start thinking about herbivores. Start slow and add as needed.