I have a bud that has one small clump of zoas that are not doing well. They look great and are opening normally- but right at the base they are pinching and getting skinny- kind of a bobblehead situation. I haven`t seen this one before- and the other thousand or so zoas are all doing well. This clump was of about 40 a couple weeks ago- and down 25% as of today. I have seen just about everything that can happen to a zoa- but this is new!