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[urville]

This thing is growing on the glass amongst some algae in my refugium.

It looks like a weird like hammer coral or something. I touched it with a piece of acrylic, and it's a bit solid feeling and didnt sustain any damage, yet flexible...

 

[acrodave]

sponge?

 

[urville]

not like any other I've had. Not like the clear pineapples, the tunicates, encrusting...

There's no open area and it doesnt appear to be porous in any way.

 

[LeslieH]

It's a type of red algae.

 

[urville]

It isnt noxious or invasive is it?
Would it be considered macro or micro?

 

[Peter Eichler]

It appears to be a red macro and they're rarely invasive IME, with maybe red bubble algae being an exception. I don't think you have anything to worry about.

 

[urville]

oh! thats great... I rather like it lol...

 

[LeslieH]

Is the white area part of the alga internal or something growing on it? If internal it might be one of the species that incorporates calcium into it's structure although not a true coralline. These tend to grow in clumps rather than spread out. They do alternate sexual and asexual reproduction if I remember right so it could still spread. The only way to find out is to let it grow. If you have a separate fuge or sump you could transfer it and watch it to see whether it's a problem or not.

 

[urville]

the white though not clear in the video appears to be bubbles...