Quickly growing colonial-mass.

[Slapp]

Hello,
This appeared out of almost nowhere. It started climbing on the glass about a week ago.
It covers a majority of the backsides of rocks, but I can’t get a good picture of it.
Slimy, not hard.

 

[Bucs20fan]

No idea. But those Dino’s are extreme that’s for sure.

 

[ISpeakForTheSeas]

Difficult to see with the pic, but looks like it may be colonial tunicates. If so, they're harmless filter feeders, but - like you've found - some of them can be pretty invasive/fast spreading:

Haha, yeah sorry - that's part of why I threw in the TLDR at the bottom there. Here are some photos of colonial tunicates with similar body structure (and some with - from what I can tell - similar coloration) to help decide if it is a colonial tunicate:

(The two above images are from here: https://www.mdpi.com/1424-2818/14/11/977 )

And the link below has a bunch more pics (some are different colonial tunicates like above, some are solitary tunicates):

Ascideacea

Ascideacea

www.floridamuseum.ufl.edu

 

[Slapp]

Difficult to see with the pic, but looks like it may be colonial tunicates. If so, they're harmless filter feeders, but - like you've found - some of them can be pretty invasive/fast spreading:

Pretty sure this is it. Especially the D picture.
Thanks.

also yeah the algae is pretty crazy. Tank is less than 2 months old.

 

[Bucs20fan]

You do have algae yes, but you also have dinoflagellates

 

[vetteguy53081]

Agree on tunicates and not so sure on dino but seeing no coral on this rock, I would place it in a container of tank water and pull off as much as you can by hand and scrub the rest with a firm toothbrush and some 3% hydrogen peroxide.
Return to tank, reduce white light intensity and number of hours of white lighting and add some snails such as :
Astrea
cerith
turbo grazer
trochus

A Pencil urchin

8-10 Caribbean blue leg hermits

Are you using RODI water or tap water from the faucet ?
What is your phosphate level?
Is tank at or near a window?

 

[Slapp]

Ok.
The Dino is not on my rocks. It’s on very fragile calcified macro algae that I cannot remove.

Thanks I guess? For assuming my tank is in dire need of your saving.

I’m not trying to be super rude but like dude it’s a picture of the ugly back corner of my tank. A very low resolution one at that. In a thread not at all connected to algae or Dinos or what have you.

It’s very silly.

 

[Bucs20fan]

Ok.
The Dino is not on my rocks. It’s on very fragile calcified macro algae that I cannot remove.

Thanks I guess? For assuming my tank is in dire need of your saving.

I’m not trying to be super rude but like dude it’s a picture of the ugly back corner of my tank. A very low resolution one at that. In a thread not at all connected to algae or Dinos or what have you.

It’s very silly.

I apologize if that is the way you were taking my statment, it was not meant that way. If I posted a picture of something and someone noticed a different issue, I would want to know about it. Specifically if it is something that will really affect my aquarium for months to come. Again. sorry for bringing it up.

 

[Slapp]

I apologize if that is the way you were taking my statment, it was not meant that way. If I posted a picture of something and someone noticed a different issue, I would want to know about it. Specifically if it is something that will really affect my aquarium for months to come. Again. sorry for bringing it up.

It’s ok. I apologize. Bad day, and I often find myself frustrated in forums. My bad.