Your zoanthids really are in need of light, current, and weekly vitamin and amino acid additions wouldn't hurt.
Why lighting? The two polyps on the right front have little or no coloration at all. They appear compltely bleached due to expelling. Most likely due to a lack of lighting do to improper placement on the reef, or simply an oversight which didn't give them enough lighting.
Why Current? The same two polyps have little or no polyp extension as well as all of the other polyps in the photo. Consistent or alternating current will carry more nutrients directly to them thus increasing polyp length over time.
Why Vitamins and amino acids? And I know many reefers have never used it and their tanks look absolutely great. I draw the same parallel with humans. Without added daily vitamins to your diet, you can live a happy, long, prosperous and healthy life. With Vitamins, your overall health will receive great internal and external benefits. I have used them for many many years. I can't remember the last time I had a sick , polyp, colony or frag. My failure rate is nonexistent now. Creetin, if you are there, share your experience with this as well. My polyps are always full and robust. I have purchase frags that were in dire straights and have recovered rapidly in my tank. Can I prove that V & A's make a difference, well, yes and no. Do I have a very healthy population of corals that appear healthy 24/7 ? Yes. Can I prove it is because of the additions of Vitamins and amino acids, no, not directly. But I can say that since I started using it years ago, my tank has never looked better.
Just my 2 cents.
Mucho Reef