coral help!!

[stone.david]

i have a blue stag (i think its a stag) and its been fine but for a couple of weeks it has been developing a brown like algae on it, ive tried to get it of even using a toothbrush but to no luck, it might not even be a algae, i see little bits on another one of my corals and need help getting rid of it. Under the T5's it looks brown but take the coral out of the water and its green??

Thoughts???

in the picture below you have see it a little bit but its far far browner than that (my picture skills are poo)

 

[dmorazan]

lighting is your problem it looks like . I had an acro that was tang with purple tip now is brown with green tips some lighting changes the sps's

 

[stone.david]

hey im not sure if lighting is the problem as all the other corals are looking good

 

[dmorazan]

sps

sps

same with me. nutrients? but dont have a problem with nutrients myself

 

[Whisperer]

Looks like cyano growing on bare areas of the coral. Increase flow and check your phos and nitrates.

 

[stone.david]

PO4 is 0ppm NO3 is 25ppm (which i know is high but its coming down)

All the other corals a doing fine and have vibrant colors, its not Cyno i know what that looks like. Its not something that can be rubbed off or even scrubbed off, its on there perminantly

 

[buzzy]

SD can you get some closer pic's?