Mystery algae found. Do I have to worry?

[Tavero]

My first idea was Bryopsis. It's definitely not though.
Was able to remove the whole 1/2 inch tuft with some pliers. Very dense and strong so it doesn't rip easily.
Fairly slow growing. And of course avoided by all of my algae eaters. No surprise there when even I had trouble to rip it off.

Some kind of caulerpa? Bubble algae species with weird growth pattern?

 

[KrisReef]

Looks like velona spp?

 

[Tavero]

Looks like velona spp?

What is velona? I don't find anything online?

 

[DED65]

Look up Valonia algae.

 

[KrisReef]

Spelling errors identified by @DED65 ,
Sorry

 

[ISpeakForTheSeas]

A valonia species is a good guess - if not one of those, possibly one of the below:

Possibly a Lychaete sp.? For example:

Lychaete herpestica Filamentous Green Algae

Lychaete herpesticais commonly referred to as Filamentous Green Algae. Difficulty in the aquarium: Not suitable for aquarium keeping. Toxicity: Toxic hazard unknown.

www.reeflex.net

If not, I'd lean toward it being something else from that family (Cladophoraceae) like a Cladophora species. For example:

Luxuriant Cladophora, Cladophora catenata

 

[Tavero]

A valonia species is a good guess - if not one of those, possibly one of the below:

Maybe. No clue.
Except of caulerpa and chaeto I have no knowledge when it comes to algae. A few months ago was the first time I've seen bubble algae in person even though I'm in reefing for almost 20 years. I will keep observing it. If it tries to give me problems, I can hit it with reef flux.