Aquarium Serial killers!

[kevgib67]

About 20 years ago I had a maroon clown that was satan’s spawn. Any fish I tried to add were dead within 1/2 hour. I got creative drilled holes in an acrylic box and hung it inside the tank with the new fish in it. After a few days when the clown seemed to lose interest I would release the fish. Dead within a 1/2 hour.

 

[SaltyT]

This guy (earmuff wrasse) is a serial killer of hermits, emerald crabs, most snails, cleaner shrimp and even a poor anemone crab.

And she (Kuiter's leopard) is his accomplice!

 

[Piscans]

i have a bluegill that attacked another bluegill and killed a green sunfish

 

[AJQ69]

Blue Tang went into an LPS killing spree, and within a week, it ate two full-grown colonies (5-6 inches). A model citizen that had a crossfire/brain fart and decided to have an expensive meaty taste..

 

[Sharkbait19]

i have a bluegill that attacked another bluegill and killed a green sunfish

How big was the tank? These guys are very territorial (basically U.S. equivalent of cichlids) so it’s not unlikely for sunfish to pick off others in a tank.

 

[Jwise]

I forgot i had a coral beauty angelfish at one time in a system i used to have that loved to eat and kill almost any sps coral that i put into the tank and it was annoying and sad to figure that out after he was doing well with any other type of coral i put into the tank he would leave softie and lps corals all alone. I put a couple of different types of sps in like a orange setosa, forest fire digitata, green staghorn, and pocolapora and it loved to eat on all of them until they died.

 

[vetteguy53081]

Emerald crabs - Never again !!

 

[dennis romano]

I bought a cute little hippo tang that was the size of a quarter. A few years later, he went psycho. The first victim was a harlequin bass that I found definned. The next two to go were a 5 inch queen angel and a blue face angel. Again, both fish definned. I thought that the culprit was my niger trigger. Finally. I found the hippo pounding on a four inch harlequin tusk. He had that poor tusk trapped in the corner of the tank and was shaking it like he was a pit bull. Off to the LFS he went.

 

[death-by-reef]

I have had one of my african cichlids kill everything else in the tank in one night. (Freshwater)

 

[SaltwaterandLime]

This is Natasha. She is my husband's clown. My husband refers to her as наташа, его маленькая убийца.... his little killer. I refer to her as the Russian assassin clown....

She is pictured here with her partner in crime, Boris.

Together they will attack and kill anything that dares to enter their tank. My hands.... tools.... the turkey baster I try to feed them with.... other fish within an hour, cleaner shrimp, peppermint shrimp, they kill everything. They even killed a decent sized tang after they had been separated in an acclimation box for what I thought was long enough.

My husband is quite pleased with his attack clown. He says she saved him lots of money because as long as we have her I won't buy any more fish.

.........I thwarted his plans by buying a second tank just for them.

 

[Treefer32]

I have something in my tank that enjoys Zoas... I had paid a large amount of money for a zoa garden rock. 5 polyps per frag plug and around 12 plugs all glued to a single rock. I paid $200. After the first week, day by day, the polyps disappeared. I have no idea if my CBB ate them day by day, or if I have dorman zoa eating nudis, or if super hidden pistol shrimp went after them in the night. I've caught no one in the act of eating them. I soaked one group in coral RX to see if there's anything that fell off as the polyps were dying. The only thing that fell off was a small brittle starfish. Maybe the micro brittle / serpent starfish had an appetite for zoas? I don't know. Are there zoa eating amphipods or copepods? I find it hard to believe when I can grow acropora successfully and some LPS that the water wouldn't be right for Zoas?

 

[Projects with Sam]

@Projects with Sam

I have a 6-line wrasse that ended 4 anthias, a striped blenny, a canary blenny, 2 skunk cleaner shrimp, 2 coral banded shrimp, and a mandarin goby.
When it was all going down, one of the anthias made an incredible leap into an adjacent tank 2 feet away... The canary Blenny and Striped blenny knew he was coming for them too because they were so sketched-out. I still have no idea what triggered him. I cant catch him out...

 

[Floyd-]

I had a Scopas Tang turn rouge and kill a yellow tang and was then going after other tank mates. Lucky for me he's also the easiest fish I have ever had to catch in the tank. Just a bit of nori in the trap and in he went without issues.

 

[Fishfreak2009]

Psycho my sohal tang lives in solitary for this exact reason. Hoping he'll do ok with the other fish when we upgrade the tank and he's the last one in there.

I've had a lunare wrasse that loved ripping the eyes out of tankmates.

And a niger trigger who would kill and eat anything yellow. Yellow tangs, the yellow half of a yellow tailed blue damsel, but any other color and he didn't care.

And can't forget the 4' bobbit worm, years ago, eating my fish at night.

 

[RedoubtReef]

yep, had a purple reef lobster that was well fed and fine for several years. I added a couple fire fish one day and later that night i was checking with a flashlight to see where they were sleeping and that lobster had half of one of the fish in his claws happily snacking away.

 

[Manny’s Reef]

Had a niger trigger who I would watch flip snails over and rip them right out of their shells.

Right now I'm trying to catch a gorilla crab who hitchhiked with tampa bay live rock.

 

[Bhor217]

Blue Line Trigger, thought I had enough predators and it was still small. Took out my mappa Puffer, and several others before being rehomed

 

[vlangel]

I have a common Atlantic pistol shrimp, Rice Krispie that has been banished to the refugium/sump. It seems that he was hunting down my masked gobies one by one at night. I think he also went after my firefish goby. I never caught him in the act but I am hoping he was the cuprit because I just acquired 4 more masked gobies.

 

[Rene']

Blue Velvet Damsel......a devil fish. Beautiful fish, but after murdering three of my other community fish, it was removed and put into a witness protection program....a friend's tank that was an aggressive fish only tank.

I had a blue velvet damsel for 3 years.. One of my first fish. She was smaller than other fish in the tank, although far as a house, so she was just a pretty addition. Then I put a diamond goby in the mix. She chased him for 12 solid hours until he finally died of exhaustion.
I have her to my son in law, who was happy to have her.. At least for 2 weeks, then he took her to the LFS, because she turned serial killer in his tank.
Beware! You can tell by their angry eyes that they're psycho

 

[ReeferCPA]

Auriga butterfly, absolutely loved acans. And only Acans.