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

My Horseface Loach. Still not sure if it is alive or dead. Added it two months ago, it swam straight to the bottom, dove into the sand, and hasn't been seen since. Cool fish though from what little I saw of it.
 
My second (current) Green Spotted Puffer.

I loved the first one (named "Rasputin"), but he had a ton of internal parasites and died after months of off and on treatment. I'd get him to pass several worms, keep up treatment for a few more days, nothing else would come out and I'd quit. He'd be fine for a month, then start with the constantly sunken belly thing again. I was feeding frozen bloodworms (Hikari), freeze-dried krill (Tetra), and tiny snails I got from PetSmart for free on occasion. I spent so much money on him, but he was a great fish, always excited to see me, very curious and interactive. The last round of treatment tons and tons of worms came out of his gills and he died, probably from asphyxiation. I was devestated and left the tank fallow for at least six months.

Finally, tired of looking at an empty tank I got my current GSP, "Frumious Bandersnatch". She is healthy as anything, living a little over a year with me now incident free. So why don't I like her? She ignores me 99% of the time, just paces up and down the glass day in day out despite having tons of decorations and such to look through and bits of food occasionally hidden to find (honestly I'm trying, I know they need things to do) and refuses to eat anything but freeze dried krill and the occasional bloodworm. All the snails I've put in I've had to fish back out a day or two later when the high salinity in her tank kills them. She let 5 of the last 25 ghost shrimp I fed her live, which is nice only because they help clean up all the food she ignores. I've tried feeding ghost shrimp since and she has no interest in them. Also tried bloodworms, tubifex, blackworms, and more. She'll eat a few, then let the rest sit on the bottom for a day till I suck them up so they don't rot.

I tried putting another GSP in with her in hopes it would liven her up and reduce the pacing, but she just freaked out for about 3 hours while it followed her around, shooting all around the tank and hitting the top several times, then turned around and removed half its fins in about 2 minutes. I pulled him out for his own good and returned him to the local fish store, and no tankmates have been attempted since...

I guess she's not a "bad" fish, I just really liked the personality of the first GSP, and she's comparatively boring and unobservant. Yet, as many others have said about their "problem" fish I can't bring myself to bring her back to the store or otherwise re-home her, so I'm "stuck" with her.

Also, the Spotted Climbing Perch I recently put in my 29G freshwater tank as a sort of centerpiece fish is taking my Neons out one by one every few days, but I think he's getting used to eating flake so hopefully that won't keep being a problem. He's cool enough that I honestly almost don't mind. If I could just "train" him to eat feeder guppies and leave the neons alone that'd be great, but I suspect I'd just end up with a tank full of feeder guppies. I'm a softy. "I can't let him eat you! You have pretty colors!"
 
My opaline gourami.It bullied all the fish in my tropical tank so as punishment i threw him in with my comets that are twice his size.Took the attitude right out of him!!!
And i gave away a really mean swordtail!!
 
Geez... from this 17 page thread you'd think there wasn't a fish alive that everyone would like. I've had some disappointments with fish for sure like the gazillion neons I stubbornly wanted to have but could never seem to get and have live for more than a few years if they made it past a few months of which most did not. Mollies I will never have again as they seem to multiply faster than the fry can be eaten. And finally I have a pair of SAEs which are constantly at each other doing a stress dance where they bump each other head to tail when in open water to the point of each of them losing color but if they aren't then the bigger one has the smaller one in constant hiding.

On the other hand, and I have been inspired by this one to make a new thread, the fish I LOVE to have are my Koi Angel, my Panda Cory, my Common Rummy Nose, my Otos, my Harliquin Rasboras and my Cardinals
 
A second, larger maingano cichlid, added to my 55g mbuna tank after 6 months without stocking changes. The original maingano (1/3-1/2 his size) chased him incessantly for an hour or so, until I took him out and stuck him in the QT after finding him struggling to stay afloat, upside down, at the bottom of the tank. He died just a few hours later. Needless to say, at this point nothing is getting added to that tank until I get a larger tank, and completely redo the rock work.

My other regret would be ghost shrimp, the most likely culprit in having been host to the callamanus worms that infected my 60g tank, killing my 2 GBRs, and infecting at least 2 jewels and maybe others that I haven't seen signs in yet. Luckily, I was able to obtain levamisole, which is supposed to be the only sure fire way of getting rid of them. Still in the process of treating all of my tanks.
 
A second, larger maingano cichlid, added to my 55g mbuna tank after 6 months without stocking changes. The original maingano (1/3-1/2 his size) chased him incessantly for an hour or so, until I took him out and stuck him in the QT after finding him struggling to stay afloat, upside down, at the bottom of the tank. He died just a few hours later. Needless to say, at this point nothing is getting added to that tank until I get a larger tank, and completely redo the rock work.

My other regret would be ghost shrimp, the most likely culprit in having been host to the callamanus worms that infected my 60g tank, killing my 2 GBRs, and infecting at least 2 jewels and maybe others that I haven't seen signs in yet. Luckily, I was able to obtain levamisole, which is supposed to be the only sure fire way of getting rid of them. Still in the process of treating all of my tanks.

I don't know if the same thing happened to me but I remember seeing a worm inside a ghost shrimp I had a long tome ago. I was a newb at the time and didn't know any better.
 
Another fish. My Koi Adult Angel that grew huge, but I am selling it because it has started eating my harlequins and tetras and other schoolers
 
i had a yellow lab cichlid that could not be housed with any other fish. chase chase chase bully bully bully
 
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