Name that one fish that you totally regret getting...

I have 3.

Honey Gouramies - died after about a week and a half and died in some sort of Romeo and Juliet story.

Pencilfish - the guy gave me two different species because they had them in the taller tanks and couldn't see them

Guppies - IDK, I kinda miss my guppies, but probably wont' buy another one.
 
A beautiful lion head goldfish. Many years ago, when I was very foolish and ignorant, I bought this beautiful and expensive fish, which I loved. But I put it in a tropical tank (mistake 1) with small fish that I assumed would leave the big guy alone (mistake 2). Walked in to find that much of his puffy crown had been nibbled away. :(
 
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I would have to say the last angelfish I bought... brought in ich and velvet and any other protozoan infection you can think of, wiped out half of my tank including my gorgeous mating pair of veil tail angelfish. :( Why I impulse bought another angel I still haven't figured out... but I did, and I paid for it!
 
Skunk loaches, cute little thugs! Nipped everyone's fins then went for cichlid's gills, the food dispensers. On top of that they were impossible to catch, they'd dive into the UGF tubes. Eventually tore the tank down.
Still, if I ever have a spare 55g or so I'd be tempted to try them again, someday, maybe with modestas +/or tiger loaches. All bad boys!

The other fish I regret was an african cichlid, a kennyi I think. LFS told us it probably couldn't live with JDs & other SA cichlids, they were right. Newbs, we didn't want to believe.
 
I would have to say my four Giant Danios. It's not their fault that they are rowdy guys who apparently don't need sleep or rest but I should have done more research before buying them.
They don't really cause any damage or instigate fights but just by being so active they disrupt the tranquility of the other fish.
 
The squirrel fish for my 100g saltwater. He essentially killed my brain coral by picking all the food away from it at feeding time. The brain coral basically starved to death. :(
 
and I paid for it!

well i hope so, just walking out with a fish can get you arrested lmao.

another one of my regrets so far has been my marmorkreb, i bought her so i could sell baby krebs and feed some of them to my fish, but she eats all her eggs the about a week before hatching.
 
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