The search for the reef massacre

[reef tank]

4 weeks of losing Zaoanthids and polyps and brain corals, ive come down to a group of suspects that are feasting an expensive meal. ive lost many corals and some often dissappear . but i have also come to find a little crab with no shell that i did not purchase and im wondering where he could have come from..i am needing your help to determine whos eating what from my aquarium please. Here is the line-up of the usual suspects:
:uzi:

 

[SaltwaterGoby]

I would go with 4 and 5 as the suspects. Although they need to turn to the left for a profile shot.

 

[reef tank]

what kind of crab is the the 4 and 5 i did not buy him i dont know where he come from

 

[Logiq]

I think that is a gorilla crab or something like that I had one in my first tank they hide in the live rock so it might have came in on a piece of rock

 

[Blindside]

4 and 5 gorilla crab usually a fish eater when larger. Would be my guess, came in with your live rock!

 

[OneReef]

Ive been losing zoanthids lately to nudibranches. They are becoming a pain in my butt to track down. Getting tired of catching them. I think they are nibbling on the edges of a couple of my LPS too.

 

[kcooley]

haloween hermit isnt really reef safe either.

 

[reef tank]

haloween hermit isnt really reef safe either.

and which one is that the orange stripe one :hammer:

 

[Reefdiver77]

I had a gorilla crab that obviously came in on my live rock and I only noticed and trapped him like 5 years later. Never noticed him munching on my corals though.

 

[nam2212]

Ive been losing zoanthids lately to nudibranches. They are becoming a pain in my butt to track down. Getting tired of catching them. I think they are nibbling on the edges of a couple of my LPS too.

Flatworm Exit worked for me. Strangely it didn't take care of the flatworms but did kill the zoa eating nudis.