Fish you absolutely regret/hate never want to keep again.

[Naekuh]

Why?

if your rockwork is not secured and not bonded together, they will burrow under and cause it to collapse.
Also they will barf sand all over your corals on the sand bed.

And they get into neighbor disputes with jawfishes like this:

 

[Badblackdog]

I second the vote for maroon clown Fish. They are absolute jerks. The huge female that I had kept the male down in the rock work and if you ever came out, she would chase him back in. She also used to knock new Frags off my live rock and would immediately go after any new fish. She also bit me every time I put my hand in the tank. An expensive lesson learned.

 

[Michael Adam]

Neon Dottyback. Devil fish.

 

[vetteguy53081]

Post a list of fish that you absolutely regret and would never keep again ever.

Powder blue rang

Flame Hawk

Clowns in general

Red coris wrasse- Gorgeous fish but will flip every coral and frag it can in search of food

 

[jabberwock]

Clownfish

 

[Damien Buckley]

Post a list of fish that you absolutely regret and would never keep again ever.

Pixie Hawkfish. Very cool fish which I assumed from having owned a couple Flame Hawks would be well behaved but in actuality was the aquatic antichrist going after anything and everything with maximum aggression. After chomping a newly introduced Orchid Dottyback clean in half and tearing the tank apart to catch him he lived out his life in the sump…

 

[Damien Buckley]

Post a list of fish that you absolutely regret and would never keep again ever.

Maroon clowns. Made the massive rookie error of introducing a pair to my 425L tank with a 7yo pair of percula clowns. They tormented the percs to the brink of death. I couldn’t catch the maroons so the percs had to be evacuated to a quarantine tank where they now live quite happily with a heap of BTA’s.

 

[DustinDec]

Aww I love my clownfish! I would probably not pick up a Hippo Tang again. That’s to say with my current 120g 4’ tank at least. Otherwise I’ve been pretty happy with all my choices.

 

[Stang67]

Domino damsel. Never again.

 

[bitstream]

I have a few.

1) Yasha Goby. Bought it and the thing immediately hid. I saw it peek out once for about 5 seconds a couple weeks later, then never saw it again. At some point, the idiot swam into the tiny emergency relief holes around the return pump eyelet and got stuck in the flow diverter attached to the eyelet. The only reason I know this is because after eons of not seeing the fish, I was cleaning the tank and when I removed the flow diverter I found what was left of the carcass stuck inside. What a waste of $70. If your tank has ANY holes a fish can potentially fit in, there's a good chance it'll try.

2) Flame Hawkfish. It's fine (so far) with my clowns and cardinals, but it murdered both black mollies within the first 2 weeks they were in the tank together. The mollies were the sweetest little fish who just wanted to swim about and nibble on the rock work and sandbed. The hawk apparently thinks the sandbed and rock work are its property and will murder anything that touches either one. One Molly it bit off its entire tail down to the meat and the other, it took a gigantic bite out of its belly. Both were dead within 24 hours of the attack. I hope it doesn't decide the other fish in the tank deserve death, because if it does, this fish is getting the boot.

3) Black mollies. Not because they are bad fish, quite the opposite. It's because when I had them in one tank, the clownfish went after them incessantly and did serious damage to their tails. Then in my other tank, the hawkfish decided they were not welcome. I kinda regret converting them to saltwater -- but my guess is that if they went into my FW tank, the betta would attack them. Seems these fish are targets for literally anything bigger than them, despite them being totally harmless and inoffensive.

I didn't put clownfish on here because other than the clowns in one tank specifically attacking the mollies, the ones in both my tanks have been awesome little weirdos.

 

[bitstream]

Sand sifting gobies

Why? Just their propensity to bury corals, or another reason?

 

[OrchidMiss]

I'll never own another hawkfish

 

[bitstream]

Domino damsel. Never again.

Thanks to threads like this, I avoided damsels of all types. I've almost never heard anything good about them. Seems that if anyone wants damsels, their best bet is to put them only in tanks with fish that are bigger and meaner than they are.

 

[Bj’s Reef]

Any and all damsels are off limits. Followed by my two Ma Tai clownfish. I’ve had the two gangsters for nine years now. Talk about bite the hand that feeds you.

 

[plutz]

Neon damsel biggest PITA!! Put a mirror in the tank and he bullied himself….calmed his a## down for a while anyway.

 

[Sump Crab]

Wartskin anglerfish. Really cool for the first five minutes, then the novelty wears off and it's just a motionless blob that needs expensive food lol.

 

[Lyzze]

Damsels

Maroon Clownfish

 

[Lyzze]

Maroon Clownfish

Maroon Clownfish

 

[Lyzze]

Maroon Clownfish

Puffer

 

[moretor1]

Orchid Dottyback

You ever see a fish try to eat a goby that's 80% of its size whole?