Couple of IDs and recommendations

[Somuchflo99]

I have these hard algae’s growing on glass and on rock wondering if it’s coraline or something else

my main worry is the really dark hard stuff

 

[Somuchflo99]

#reefsquad

 

[saltyfilmfolks]

The dark black stuff won’t come off with a toothbrush?

 

[Somuchflo99]

I’m scared to mess with it salty do u have any idea what it might be

 

[saltyfilmfolks]

I’m scared to mess with it salty do u have any idea what it might be

Mess with it.
It’ll be fine. In a small spot try to scrape a bit.

My first thought is a sponge. Second would be an alge.

 

[Somuchflo99]

Ok will do but what about the stuff on the glass/acrylic

 

[Somuchflo99]

That stuff doesn’t come off for the life of me

 

[saltyfilmfolks]

The stuff on the glass looks like corraline algae. Should be hard but not impossible to take off.

Is this a pretty new tank ? Was it all white dry rock?

 

[Somuchflo99]

No was Fiji rock I believe tank is 10 months old

 

[saltyfilmfolks]

Hmm. So the color in the rocks is being replaced?

The stuff on the glass is normal.

 

[Somuchflo99]

The very beginning yea seems like the dark stuff is the same stuff just layers up so dark that it looks black

 

[Somuchflo99]

Just scratched at it come of if I scratch with a fingernail not with the toothbrush

 

[saltyfilmfolks]

Regular corraline should pink or Purple up over time.
The first one are pretty weird looking.

You’ve got normal corraline growing on the back wall and pumps am stuff ?

 

[Somuchflo99]

Just looks dark green under the blues it looks kinda purple but the dark stuff had me kinda tripping but it’s not fuzzy or anything and I mean nitrates are I little height but everything else is great so I guess just point the flow towards it and see if it goes away if not let I grow it’s not really harming anything u think right

 

[S-t-r-e-t-c-h]

There are many different species of coralline algae, so I don't think this is a problem. The purple should take over in time. Here's a bit from reefcleaners...

https://www.reefcleaners.org/coralline

Coralline comes in many shades and colors, and one of the fastest growing encrusting coralline species likely to be encountered in aquaria are green in color and may make you think you have a type of nuisance algae growing on your rocks. You can distinguish green coralline algae from film algae by testing its hardness, coralline should not come off easily when toothbrushed. Fast growing green coralline algae usually takes up residence on bare rock, and is often later engulfed by epiphytic coralline algae that have "better coloring" like reds, pinks and purples.

 

[Somuchflo99]

Thanks for your help you guys @saltyfilmfolks and @S-t-r-e-t-c-h that article said it all