Is this STN?

[Stand_Alone]

I took these photos this morning before lights on.

 

[swanny]

I'd say no. When lights are out sps have a lot of white looking areas but yours look healthy to me.

 

[Stand_Alone]

Phew -

Visually, my pink mille looked like it was losing tissue in the inner branches.

 

[joncver]

check for hairy crabs during lights off?

 

[rogerwilco357]

use a baster and blow the corals off with a burst of tank water and see if any bugs fly off like little worms or red bugs if you think those are patches of tissue loss ?

 

[plyle02]

They look like irratated spots IMO, I don't suspect AEFW unless you see abnormal tissue irratation or sliming. It looks like a pest is feasting on polyps of the sps near base and shaded areas of branches. I don't suspect AEFW based on pics, but could be redbugs or a nipper of some sorts, please mention fish in the tank and all inverts...
Thanks

 

[Stand_Alone]

check for hairy crabs during lights off?

I checked and so far no hairy crabs. I did dip every coral in CoralRX before introducing to the tank.

use a baster and blow the corals off with a burst of tank water and see if any bugs fly off like little worms or red bugs if you think those are patches of tissue loss ?

I tried basting today. No bugs flew off. I do have brown flatworms at the moment but they don't seem out of control. None were found on the corals.

They look like irratated spots IMO, I don't suspect AEFW unless you see abnormal tissue irratation or sliming. It looks like a pest is feasting on polyps of the sps near base and shaded areas of branches. I don't suspect AEFW based on pics, but could be redbugs or a nipper of some sorts, please mention fish in the tank and all inverts...
Thanks

Fish are 3 ventralis, 2 hooded fairies, 1 melanarus and 1 leopard wrasse. Inverts are 2 cleaner shrimp and various snails/hermits.

 

[Stand_Alone]

For comparison. Just want to know if this is normal behavior for SPS.

Lights Off

Lights On

Lights Off

Lights On

 

[joncver]

the possibility of crabs is high, based on my experience. just a few weeks ago, I noticed my bubblegum milli having the exactly the same "bald spots" as yours. night time came and about a couple of hours after lights of i pointed a torch light at my colony and saw a hairy crab feasting on it. seems like it hides at the rocks by day and comes out to feed at night.

 

[jc-reef]

They look like shaded areas of the corals which would be lighter/whiter in color. Based on the pics you posted, I don't notice any tissue damage/loss.