What is this?

[RJ F.]

Hey yall. I'm back again with another question. I found these dark patches growing on my LR. I've had the tank running for about 8 months now. I'm starting to get really nice blooms of coraline on the back glass and rocks. However tonight I was cleaning the tank and started noticing all these really dark spots. I turned just the whites on and took some pics. Hopefully yall can ease my mind. I looked up black coraline algae and now I'm in panic mode lol. Thanks in advance! If yall need any other pics let me know!

 

[Big G]

Bump

 

[Mastiffsrule]

Good morning. Kinda hard to see, but it looks like black sponges forming. They can grow in patches if it is. Some people hate them, they can be invasive. I don’t mind so much.



I was also noticing in the first few pic there are bubbles in some algae. Are they starting to show up on their own or maybe coming from bubbles out of a pump?

 

[Subsea]

I can ‘t tell by these pictures. Look at reef cleaners link to see what you have.


https://www.reefcleaners.org/nuisance-algae-id-guide