Most destructive invert you've ever kept?

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It's no surprise to anyone that there are quite a few destructive invertebrates out there in the reef keeping hobby. Some that are obviously labeled as not reef safe safe like decorator sponge crabs, Murex snails, or large hermit crabs. Sometimes even reef safe invertebrates can take a turn for the worse and start messing with your tank, have you had something like this happen to you?

 

[nautical_nathaniel]

Ruby/Red Reef Lobster - 2 fish and a couple corals by the time I was able to evict it only had it 3 days.

 

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Ruby/Red Reef Lobster - 2 fish and a couple corals by the time I was able to evict it only had it 3 days.

Darn that's alot of damage for only 3 days, you have my sympathies.

 

[helmsreef]

Purple reef lobster, had one for about 3 years and was bought when it was about 1.5". Mostly forgot about it until fish started missing and no signs of death. Come to find out that the lobster was now 4.5" and preying on sleeping fish. The last victim was a juvenile Australian Stripey. Lobster has since been removed but I think he ate at least 10 fish over the years. Never again