I have noticed that when my zoanthids are shriveled and looking like they will melt, if I dose strontium they get better and back to normal the next day.
Coincidence? This is pretty much consistant now. I do water change once per month and when ever my zoanthids start to look bad and shriveled I add strontium and they recover nicely.
Because of that I now dose Seachem Reef Strontium once per week. After analysis of my water by a pro lab, I was told that my strontium level was low and since I started dosing this, it really seem to help my zoanthids and paly.
I also dose Lugol, but dosing Lugol alone never did seem to do a beneficial effect on the zoanthids. I have been dosing vitamine C for a year now and that seem to help a bit but they still had episode of melting/growing.
If you try it, let me know if it work for you. Hope I am not imagining things and these are not just a bunch of coincidences. Also feeding them with Fauna Marin Ultra Zoa get them growing nicely.
Good luck with your zoanthids
