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With only one colony in a new tank, you should be able to take care of this without too much trouble.
I didn't do hot water. I just brought RO water in line with my tank for temp and pH. I let the zo's sit in it for 5 minutes, then turned them upside down and really whooshed them around in the water. Nudibranchs fell out like crazy. I pulled them out and looked over them carefully with a magnifying glass for eggs and pulled those off with tweezers. Then I swooshed them again to make sure I rinsed everything off.
I did this to 7 colonies Monday and by the next day, all of them were opening and looking much happier to be free of the critters. Well, the only colony that took a couple days to open was the one that had been closed down for almost a week before by the nudibranchs.
To do it right, they ought to be dipped again every 3 days. I'm not sure how long it takes. If you can keep your one colony clean, they should die out in your tank.
Good Luck
Cathy
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