Brown spots on dry rock?!

[Dylan7huskies]

My tank is about 3 weeks old and I had to remove the dry rock yesterday for about 5 hours to remove a pesty damsel. When I placed it back in I noticed these brown spots all over the rock? Any ideas what it is? Thanks!

 

[flchamp89]

Looks like diatoms part of a new tank.

 

[Dylan7huskies]

Looks like diatoms part of a new tank.

Is this good? Bad?

 

[flchamp89]

Is this good? Bad?

It's good in the sense the tank is maturing. They will pass. Once cycled start adding your CUC. You can tooth brush them off especially if you have a skimmer.

 

[Dylan7huskies]

It's good in the sense the tank is maturing. They will pass. Once cycled start adding your CUC. You can tooth brush them off especially if you have a skimmer.

CUC??

 

[flchamp89]

CUC??

Clean up crew
Snails hermits pods ect

 

[RomoFL]

Is that coralline algae already in your dry rock or is that putty?

 

[Dylan7huskies]

Clean up crew
Snails hermits pods ect

Gotcha! So should I let it go or start brushing them off?

 

[Dylan7huskies]

Is that coralline algae already in your dry rock or is that putty?

That’s just putty! The glue !

 

[Crabs McJones]

Looks like your dry rock is becoming live

 

[Dylan7huskies]

Looks like your dry rock is becoming live

So leave it be??

 

[Crabs McJones]

So leave it be??

Yup