Slimy Coating on Acro Tips

[FSOL]

Hey guys,

One of my acros keeps developing this slimy coating on its branches and I'm not sure why.
It's in a nice flow area and under MH lights. Other acros in that vicinity are doing fine, but not this guy.
A few times I've shook it around in the tank water and all the slimy film has come off of it, but then again a few weeks later, same thing.

What is this, what should I do about it, is the coral dead, is the slimy film affecting other corals when it gets blown off of it?

Any advice would help

Thanks so much

 

[wentreefgirl]

Pics, water perimeters, lighting specs. Cant help without more info.

 

[FSOL]

water params and lighting specs are all good. All other corals are doing great, but here are the params anyways:

SG 1.024
temp 78-82
amm, nitrite/ate - 0
PO4 = 0
mag - 1300
ca - 420
alk - 7-8dkh

 

[wentreefgirl]

No pics?