Losing my favorite acan colony..HELP!

[Mattyice008]

So I've had this rainbow acan colony for over a year..its been fragged a few times.. Grows great, super healthy. I will attach a first pic with what they normally look like. For the past month, they have looked TERRIBLE! the heads are shrunken, barely open and barely extended, I can sometimes get a head or two to eat a small piece of food. The ONLY thing I've changed recently is salt. Went from reef crystals to red sea coral pro...but EVERY other acan and LPS coral(tank is lps dominated) is doing great. I am a manager at a LFS, and I know what I'm doing, but these acans have had me stumped for the past month...here's the pics as well as parameters.

Alk- 9.8-10.1 dkh
Calc- 480-490
Mag- 1600
SG 1.025
Na-0
Phosphate- barely any

Tank is a nuvo 16, basic filtration, mostly live rock and macroalage in the back. 3-5g w.c every 10days.

Dosing 3mL of fuel twice a week
1 drop of zeovit coral Vitalizer every 2-3 days

3-5mL of live phyto every other day

Pics taken today, except the first one where theyre healthy. Just fed the corals

 

[Mattyice008]

And lighting is with a kessil 360w on controller. It ramped up to 100% intensity and 35% color for a while, then I dropped it to max out at 85% intensity. Started this about 2 months ago

 

[Mattyice008]

Noticed a little skeleton poking out of a chalice tonight.. Will do a large w.c in morning and track results

 

[Acanholic]

dip it

 

[Mattyice008]

Iodine dip? Don't have any lugols or coral rx on me atm just weak iodine

 

[Acanholic]

Lugol is iodine just different concentration. Coral RX would be perfect.