Please help with my Duncanopsammia (i think that's what it is)

[jeffreed39]

I am getting frustrated with this guy he was out a little over a week ago eating and looking great then he started to close up. I was having trouble with my yellow sebae and long tentacle anemone not wanting to open up fully and a week ago I had to take them out (dead) the sebae was under some rocks and by the time I got it out it had started to decompose..... :deadhorse:
I did a 30% water change, changed the sock and sponges new also recieved my 220 gallon skimmer to go into my 30gallon refugium.
I have been testing like a mad man to find the problem and was stumped untill i tested my KH which was very low at 79ppm, I hae been adding baking soda to raise the hardness and is currently at 111ppm.
salinity - 1.026
Phosphate - 0 api (test kit used)
Magnesium - 1360 red sea
Calcium - 460 api
nitrates - 0 api
nitrites - 0 api
Ammonia - 0 tetra
Iodine - .06 red sea
PH - 8.0+ tetra

I feed mysis and brine once a day pea size

besides my list below I have a powder blue tang, 4 nazaras snails.

All my other corals look happy, mushrooms, coco worm, polyps(2), xenia, ricordea, bubble coral (not fully out).

could the KH be the problem? :headwally:
Really dont want to loose this guy......

Thanks for any help this is a great forum love it!!!!

 

[M007]

Duncan's will close up when water perams shift or out of spec. You want to bring your KH up to 145 and wait a week to see the results. Pretty hardy coral, should open back up. When it does feed some mysis shrimp but be careful. They love to eat. If you love Duncans target feed mysis :eek2: