Unknown dark purple fuzz?

[karimwassef]

I don't post here much since I have a mainly SPS tank but I thought marine plant and macro experts may be familiar with this species?

Can you help me ID it?

<a href="http://s1062.photobucket.com/user/karimwassef/media/32CF74EA-3F0F-4B22-B0DA-C8F44D157353_zpscp6siesb.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/32CF74EA-3F0F-4B22-B0DA-C8F44D157353_zpscp6siesb.jpg" border="0" alt=" photo 32CF74EA-3F0F-4B22-B0DA-C8F44D157353_zpscp6siesb.jpg"/></a>

<a href="http://s1062.photobucket.com/user/karimwassef/media/309E3AC5-4D22-48B7-978F-8292FC5CCCA7_zpsn0vubzmy.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/309E3AC5-4D22-48B7-978F-8292FC5CCCA7_zpsn0vubzmy.jpg" border="0" alt=" photo 309E3AC5-4D22-48B7-978F-8292FC5CCCA7_zpsn0vubzmy.jpg"/></a>

<a href="http://s1062.photobucket.com/user/karimwassef/media/DB378788-C0A6-41EF-B7F8-790BD9131F44_zpsro0ztcm9.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/DB378788-C0A6-41EF-B7F8-790BD9131F44_zpsro0ztcm9.jpg" border="0" alt=" photo DB378788-C0A6-41EF-B7F8-790BD9131F44_zpsro0ztcm9.jpg"/></a>

<a href="http://s1062.photobucket.com/user/karimwassef/media/91798012-B56B-438A-AC76-E0D6DE2D067B_zpsbddmhbbd.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/91798012-B56B-438A-AC76-E0D6DE2D067B_zpsbddmhbbd.jpg" border="0" alt=" photo 91798012-B56B-438A-AC76-E0D6DE2D067B_zpsbddmhbbd.jpg"/></a>

It seems to like the shade

 

[karimwassef]

I can "peel" it off with tweezers, but I want to know what it is.

<iframe width="560" height="315" src="https://www.youtube.com/embed/hhIjIHFm5cE" frameborder="0" allowfullscreen></iframe>

It's not hair algae - this is dark brown or purle/violet.
It's definitely spongy and won't just come off (see it in the surge flow in the video)
It spreads mainly by covering a surface, not appearing over all rocks like an algae.
It's not cyano - it doesn't blow away.
It's not dinos - it's there day and night and only on rocks - never on sand. It's also a solid mass, not bubbly or snotty.

It feels like "moss"...

 

[Darth_Tater]

This is a completely useless to you reply, but that looks almost exactly like freshwater Black Brush Algae (BBA)! Luckily it's a freshwater plant because that stuff's nasty.

 

[karimwassef]

This is a completely useless to you reply, but that looks almost exactly like freshwater Black Brush Algae (BBA)! Luckily it's a freshwater plant because that stuff's nasty.

thanks!

Anyone know?

 

[karimwassef]

Here's a video of it

<iframe width="560" height="315" src="https://www.youtube.com/embed/nINOs8GSs4I" frameborder="0" allowfullscreen></iframe>

Need experts!