Able to Frag Zoas underwater?

I'm assuming there is a strong reason for you to frag them in the water.
Perhaps it's on a big rock?

That will depend on how you will do it and how many frags. You need to take a look at the whole picture. If you have a good number of fishes for the tank size, how efficient is you skimmer, type of zoas (actually, what zoanthids)...

The main thing is that you don't want to have too much of the internal fluids from the colonies at once flowing around the system.
Good to have in mind that you take greater risk of accidently cutting yourself when fragging the colonies in the tank.

When you cut in the system you'll have some difficulty to keep them without infection because you won't be able to dip the colony in the tank (if it's a big rock). You can remove the frag and dip it, therefore preventing infection on the frag. Just watch the mother colony to make sure you won't have trouble with infected open areas (where you've cut).
But if you can dip both, that's great!!

Turn off the pumps, go slow and make sure there are no fishes around.
Do just a small frag at a time/day.
Partial water changes do help to export the junk, but a good skimmer will do the job too, depending on how many frags per gallons.
Make sure you will be using new tools to do a clean cut and glue them on the rocks/plugs out of the water.
Don't forget to turn on the pumps after finishing the frags.
Dip them to prevent infections.
Wear goggles, gloves and keep your mouth shut when you glue them on the plugs, out of the water.

Good luck!

Grandis.
 
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