I’ve looked everywhere and can’t find what these are

[gregoryreeftank]

Here is a picture of a piece of dead coral that has some of these green disk/ umbrella looking growths, they’re on everyone of my rocks but hard to capture a photo. , if anyone knows what they are and if they’re harmless or hat please let me know!

 

[Reefer_kano]

I dont know but following.

 

[vetteguy53081]

Here is a picture of a piece of dead coral that has some of these green disk/ umbrella looking growths, they’re on everyone of my rocks but hard to capture a photo. , if anyone knows what they are and if they’re harmless or hat please let me know!

Pics a little fuzzy but may be a macroalgae known as mermaids wine glass

 

[bushdoc]

I second that^^^, AKA Acetabularia

 

[gregoryreeftank]

Pics a little fuzzy but may be a macroalgae known as mermaids wine glass

I don’t think that’s it , they don’t really have a stem ; and if I take my tweezers they can be scraped off the rocks . Here’s a picture of them in the tank, almost flower like looking ?

 

[bushdoc]

There are stemless (mermaid) wine glasses

 

[vetteguy53081]

There are stemless (mermaid) wine glasses

Agree

 

[gregoryreeftank]

I was able to find what they are , still no clue if they’re harmful though?

 

[JoJosReef]

I was able to find what they are , still no clue if they’re harmful though?

Super interesting! I doubt they are harmful. Calcified macros aren't the fastest growers like Caulerpa. Adding that to my list of macros to look out for!

 

[ISpeakForTheSeas]

I’d guess that - at worst - it could turn invasive and leave you needing to find a way to remove it, but it reportedly typically doesn’t last long in aquariums:

Section: Algae (Green): Group: Calcareous Algae: Species: Parvocaulis parvulus (Umbrella Alga, Parasol Alga)

Marine Aquarium Library: Calcareous Algae, Parvocaulis, Parvocaulis parvulus

www.saltcorner.com

Edit: Just to add, the site lists it as a good species; generally those species are fine and don’t cause problems, but occasionally (like the Neomeris sp. listed on the site) they become highly invasive in someone’s tank - it’s rare, but it does happen. So, I’d guess the algae will be fine for you, but you never know until it plays out in real time.

 

[gregoryreeftank]

I’d guess that - at worst - it could turn invasive and leave you needing to find a way to remove it, but it reportedly typically doesn’t last long in aquariums:

Section: Algae (Green): Group: Calcareous Algae: Species: Parvocaulis parvulus (Umbrella Alga, Parasol Alga)

Marine Aquarium Library: Calcareous Algae, Parvocaulis, Parvocaulis parvulus

www.saltcorner.com

Edit: Just to add, the site lists it as a good species; generally those species are fine and don’t cause problems, but occasionally (like the Neomeris sp. listed on the site) they become highly invasive in someone’s tank - it’s rare, but it does happen. So, I’d guess the algae will be fine for you, but you never know until it plays out in real time.

Thank you so much I’m going to do a calcium check and see if my levels are higher than usual I really appreciate it!

 

[Gumbies R Us]

Interesting I don't think I have ever seen these before