My Cespitularia frag was doing well for the past couple of months, but recently it hasn't been extending during the day. Currently it still looks blue, but smaller. It's still firmly attached to the rock/is upright, it's just not opening up as much as it used to. I tested my alk and it was at 8.4 so I added some Reef Code A and B to bring it up a little. I also read that low iodine could cause this issue so I added some Seachem Iodide as well. All other corals (LPS and softies) are doing well. The only change I can think of is I moved a Kenya tree "upstream" of the Cespitularia, so I'm not sure if there's some type of chemical warfare going on? I am running carbon though so I figure this shouldn't be an issue.