Hard Brown Small Circular Algae

[heyItzCathan]

Hello. Over the past week, I’ve had a hard brown algae appear on my walls. The way I can describe it is it’s brown, circular, each circle is around less than a centimeter wide/radius, it’s very hard to remove (I’ve tried a drivers license and my nail and it puts up a fight but eventually falls off) nothing stronger since it’s acrylic. I’m thinking it’s diatoms but just wanted to check in with you guys.

Edit: I did want to mention that I use RODI water (2 month old BRS kit) so not sure where the silicates came from as that’s what diatoms eat? I’m assuming there’s silicates since the diatoms appeared but I’m not sure.

 

[BetterJake]

Picture under white light?

 

[heyItzCathan]

Here’s a picture

 

[heyItzCathan]

I tried a 3 day blackout and it did very little. Is this coraline?

 

[heyItzCathan]

Here are my levels:

Ammonia - 0-0.25 (I couldn’t tell the color but it was in between those numbers)
Nitrite - 0
Nitrate - 10
Alk- 7dkh
Phosphate - 0.25

 

[heyItzCathan]

Hello. Can someone help me

 

[mermaid_life]

Looks like Coraline to me. How old is the tank?

 

[heyItzCathan]

Looks like Coraline to me. How old is the tank?

Oh no! And I started this on May 13. So a little over 2 months.

 

[mermaid_life]

Coraline is good! You're good and doing great