[Monster Fish]

Looks like Caloglossa. A red algae sometimes sold as a red moss.

 

[Monster Fish]

Monster Fish, yeah, it is! http://www.mikroskopie-forum.de/index.php?topic=17828.0
Thank you, you're real pro!
This algae is bad or good?

Hunter, it can be brown algae too. You need some flow on java moss and syphon it.

Depends if you want it everywhere. It can become a weed and attach to everything in your tank.

Seems like there is little information about it used in aquariums but I see that the Germans have tried it. As interesting as it is I would try to grow it if I were you.

http://www.flowgrow.de/db/aquaticplants/caloglossa-cf-beccarii

 

[Monster Fish]

Right now it's only attach to java moss.

http://www.flowgrow.de/db/aquaticplants/caloglossa-cf-beccarii

OMG, so it's very hard to remove it???

It can be if you have it in moss and it attaches somewhere you don't see it.