Zoanthid eradication...

my same suggestion GEBC - but apparently the rock is a keystone in the tank - remove it and everything else will fall :eek1:
 
I hate to post here (killing zoas) but this one is easier than you think. I've used GEBC's idea to target Aptasia that was actually mixed in with zoas. Yes, they do sometimes co-exist.

I just made mine almost into a paste. Close to the consistency toothpaste would be with a few drops of water mixed in. I then use a syringe (obtained through a ink cartridge refill kit) to target the victim(s). As long as your careful in the delivery you will be able to minimize any unwanted victims. The Kalk will simply fall onto the intended target and burn them up. They key is using a very small amount applied.
Since the kalk doesn't actually disolve into the water very much (if at all) it's fairly easy to control the amount and the target point that will be affected.
 
if you can get them away without killing i would love to get some blue zoos in my tank i have different size rock if you need to replace the one that they are on
 
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