What Works
Salifert Flatworm Exit does work on adults using 1 drop for every 128oz or basically 1 drop every gallon of your tank. I haven't had the courage to dose the tank fully as flatworms and nudis give off toxic substances in the tank and I have far more to loose than gain by a full tank dose at this time. If you use the recommened dosage (4 drops every 5 gallons) in tests nudis die as well, but I have seen a couple get slow and take quite a while to die off leading me to believe they could survive at that dosage. Using my dosing none survive and they die very quickly usually within a minute.
Pro Coral Cure works just as well on the hatched nudis. They seem to die off in about 5 minutes. I would think a 15 or 20 minute dip will do the trick.
Furan2 does not work against these nor is it designed to work against these. However, it is a valid treatment (at least for many no scientiffic proof however) for zoa pox and I recommend dipping with this substance as well.
Hyper Salinity works as well and first deaths occur after about 20 minutes. Problem with the treatment is it will likely kill or harm incoming zoas and other corals.
QT... no suprise here waiting 4-6 weeks before moving any living thing into the main tank can save you hassle down the road. QT and good obeservation is still probably the safest form of pest control in general.
Capture and Removal: This technique will keep your zoas alive indefinitely and done religiously will likely cull the population until they are all dead. I have read numerous threads and have at least two people who ridded themselves of these annoying critters using this method. More details on this below.
Capture and Removal
The easiest capture technique is to use the following: Handheld Blacklight, Tweezers, Latex or Nitrile Gloves
Wait for the lights to go out.
Kill the flow in the main tank.
Turn on the black light.
With glove on gently touch any open zoas in the area you are searching. This will cause them to retract.
Now with one hand shine the black light over the zoas and with the other look for glowing critters
When you find one, tweeze and remove.
Eggs
The life span of the eggs seems to be about 2-3 weeks and to my knowledge no known treatment will kill them. I would suggest performing QT or dipping zoas regularly for at least 4 weeks. The eggs will in almost every case be attached on or near a zoa colony but they will deposit eggs on the rocks near zoas so those can be considered "infected" as well.
Additional Benefits
I have found doing research that performing a dip of Furan2, Pro Coral and Flatworm Exit will likely nuke pretty much any annoying critter you don't want in your tank short of egg stages. Also, using a Flatworm Exit and Furan2 bath for Fish Only looks to be a good precautionary treatment as well.
