ID macroalgae on live rock

[Kobooi]

I started a tank 6 weeks ago with live rock from Indonesia.
Some halimeda is growing slowly, and one macroalgae growing very fast (1 cm per week). I have not been able to ID it. It's a teal color.
Help would be very much appreciated!

 

[Seabiscuit]

The macroalgae in the center looks like Red Razor Bryothamnion triquetrum. The one I have is a burgundy red.

 

[Kobooi]

It's indeed the large one in the middle. It looks like red razor, except the color is teal. According to gbif.org bryothamnion triquetrum doesn't occur in the Indo-Pacific. Could it be something else?

 

[Seabiscuit]

You're right. Unless it hitchhiked from Florida, it could be something else. It has a sawfish pattern. You might try a search at INaturalist to see if you could search by community of Indonesia and species algae.

Observations

coralline algae from Indonesia

www.inaturalist.org

I will be watching your post to see if someone tells you what it is.

 

[Seabiscuit]

It may be a Eucheuma Species Farmed in Indonesia for Carrageenan and salads
(especially spinosum/denticulatum)

WoRMS - World Register of Marine Species - Eucheuma J.Agardh, 1847

www.marinespecies.org

 

[Kobooi]

I'm convinced it's eucheuma spinosum. Thanks!

 

[cristata.reef]

I haven't chimed in on R2R in ages, but the algae in the center of the pic is Acanthophora spicifera. It has a a nearly circumglobal distribution in all the tropical and subtropical waters but originally hails from the Pacific.