Ok! It's definitely something in my tank! I just had this happen again to a couple polyps that have been attached to a rock for over a year!! What is going on?!?! same thing, they fell off individually. So, are they trying to move around like mushrooms? or what? this is the third frag that this has happened too, and this one is my favorite! (see my avatar).
In addition, some others are having some folded over skirts. I was hoping that they just need to be moved up or down in the tank (for different light) as all other corals and more than half of the zoanthids are doing just fine.
I test my water once a week, and here are the general parameters. its an 8 gal with lps, zoas, couple softies, a nem, and one monti.
salinity: 1.025 (tank has an ATO, so this stays dead on)
KH: 6-7 (usually have to dose, this stays lower)
nitrates: always >2 (this tank gets a water change twice a week!)
phosphates: .03-.25 (ugh, hence the water changes, and bag of phosgaurd! constantly battling this)
calcium: 380-420
temp: 78
the hornets make it look like its a flow issue, but the water movement goes in the exact opposite direction that they are folded over in.
as i said, some of the zoanthids are completely fine and happy! (the fruit loops, both green ones, rastas, and the purple ones at the top) the hornets, orange skirted closed ones, and the pink/purple large ones are the frags that are having issues.
i love my zoanthids! please help!