Acro issues - am I missing something?

[risin]

I have some Acros that are showing some issues. I don't see anything on the pictures, and I dipped 3 affected pieces in fresh water, bayer, and iodine; didn't find any critters. The symptoms look similar to AEFW, but I can't find any eggs or Flatworms. while inspecting one of the pieces, I saw something that looked off, but it kinda disintegrated when I touched it with a tooth pick. Not sure if it was a flatworm not letting go or just dead flesh. I have attached some pictures of a small milli frag that has 2 affected spots. The most affected coral has been a tri-color, but it's not in a good place to take pictures.

The only problem chemistry wise is my alk has crept up from 7.7 to 9 over the past month. PH probe on the CaRX is due to be calibrated. In my experience alk swings typically affect the tip or cause RTN; never noticed spots of necrosis from an Alk swing.

Current parameters:
Alk: 9dkh
Ca: not sure, running a CaRX and it has never been out of line with Alk.
phos: .04
NO3: 5(ish)
Salinity: 1.026

Thanks for looking and I appreciate any advice.

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and a FTS just because:
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[Reefpilot11]

Following along. I have similar problems.

 

[snake1]

Me too .....but I found my alk over 11dkh so I really let it go ....shows how lazy I was and let my testing go to the way side I guess I got to comfortable with the calcium reactor ...and my ph controller was giving false readings due to moisture in the controller.

 

[bangai64]

Milli's and tri's are a favorite of aefw. See any egg clusters anywhere?

 

[MrHarvard]

Honestly doesn't look like AEFW is the culprit from the pic. You would see at least a couple tiny circular bite marks it you were starting to see tissue loss like that (generally that is) and I don't see a single bite mark in those picks. It's kind of odd for sure though. It almost looks like it was stung by another coral. I have had similar things like this happen when I Alk crept up but normally its at the bottom or on the tips. Following along to see what u find.

 

[risin]

That's been my experience with alk swings too. Letting the alk drop down to 7.7ish which will take a few days . No noticeable change, better or worse, as of yet.

I inspected some of the spots more closely, and can't find any sign of critters.