zoanthid assassin?

[fishytime]

+1 on the worms as a suspect. If they are disappearing overnight then it is unlikely(but not impossible)that shrimp, fish or nudis are doing the damage.

[pastout]

i had a tiger cowry wipe out all mine once i didnt find out it was him until halfway through my last colony

[christyf5]

+1 on the eunicid worm. I had one that mowed down colonies of zoos and ricordeas overnight. You'd have to have a lot of nudis to take down that many zoos overnight. And with that many you'd definitely see them IMO.

[TVR]

How about the hairy crab as mine? - It keep sitting on corals at nite and make me feel like the corals getting vanish afew pcs

[Red Coral Aquariums]

+2 on the eunicid worm.

[TVR]

I heard this kindda worm can grow to... 4 ft ? - Not really seen, but sound scary and sure I would jump outta there if seeing one in my tank

[JTaylor420]

Ya it is bizarre full healthy colonies disintegrate or something i had a colonie probably 300+ heads i fragged out 2 20-30 head colonies and still had probably 250+ left and now i have none =( any ideas on how to get a worm out or do i just camp out my tank at night and just rip him out on sight?

[Okguy]

Originally Posted by JTaylor420

any ideas on how to get a worm out or do i just camp out my tank at night and just rip him out on sight?

If it is a Eunicid worm, you will need to camp out and find out which rock it lives in and then your best bet is to remove the rock. If you try to rip him out you may end up with several worms as the segment relatively easily.

Good Luck!