Black spots showing up on rocks and part of GSP?

[necrio]

They have been progressively spreading. I thought it might be too much light, so I turned off half of my t5 for a couple days to see if it goes away. But I am not sure what it is! I never heard of rocks getting burned. But a part of my GSP is turning black too, however it still has green hands coming out.

Also, I was curious if you think this Birdsnest is dead.. Most of it is gray, but after 3-4 weeks, this part is still green.

Thanks!

http://imgur.com/O22wPGU,1Z352sd,0KAkB2F,0ZtokYQ,tPcznsi#0

 

[necrio]

Sorry about Image size too. Dont know how to resize.

 

[ReeferBill]

At first it looked like Cyanobacteria but the black color must be some other form of bacteria. Can you siphon it out or scrap it off?

 

[necrio]

i dont think i can scrap it off. or siphon

 

[necrio]

Update: At a closer look, it has a purple hint to it. Also, I did rub it a bit and some came off, but the rocks it is impossible to get much off. I massaged the GSP and got most of it off though.

Any idea what this moldy like substance is? It feels like wet nori

 

[S13<3]

the last pic looks like a sponge, but in the first pic your rocks look real fresh and could just be going thru the stages of becoming established live rock