I have a Xenia in my tank and it looks like it's on the decline. It looks like its shrinking and the arms do not extend out; they look shriveled. My other corals: bubble, zoos, frogspawn, torch, candy cane, and various mushrooms are doing well. I told this to a dude at a lfs
and he recommended I try adding iodine. I told him that I do weekly 5 gallon Pwc
to my 16 gallon, and that ive always thought I didn't have to add any chems if I did this.
1. What do you think about the comment about adding iodine?
2. Do I have to add chems if I do my weekly pwcs?
3. Are there any negative side effects to adding iodine?