What do you think is the hardiest fish?

Mollies. Mine have been through hell and back at least 5 times...

Here's the story in short:

1 - Unheated 1 gallon plastic container. This is from when I had no idea how to care for fish.
2 - Unheated, under-filtered 30tall with 6 goldfish.
3 - Strait drop from fresh to salt and back again
4 - temps ranging from ice over the top of an outdoor pond to upper 90s.
5 - Bleached. Long story short my sister "accidentally" spilled about 2 cups of bleach into my 10gal tank when she was in a bad mood. Lost 2 mollies of about 17 (all fry).
6 - IDK, but it killed off my black skirts and german blue ram.
7 - Air. My moms friend once dumped out my entire backyard pond (not knowing it had fish in it) and I lost 3 molly fry, but one managed to survive at least 2 days in about a half-cup of water.
8 - being flung across the floor when I tripped carrying them to their new tank a few years ago.

All in all, I don't think it's possible to kill them :/

EDIT: In fact, the one that was stuck in the 1/2 cup of water for 2 days was also a survivor of the bleach incident, the tripping incident, and the IDK incident, plus it survived 3 days of freezing weather in my outdoor pond and the upper 90s temps in the same pond. It's the only black one I've got left lol.
 
moray eels. short of severing their heads they bounce back from every injury. and i would have to say polypterus considering i found one in an ornament ..... that i removed from the tank 1 week before i realized where he was. he was still alive in the garbage bag i had put the ornament in.
 
black skirt tetras... no contest. mine have been through 2 fishless cycles, 2 columnaris outbreaks, ich, 2 moves, 3 total tank wipeouts, and being in a school of 3 in a ten gallon for 6 months where they did nothing but attack each other all day. all 3 of them now have 3 other buddies in a fishless cycled, planted, overfiltered, 29 gallon tank as a reward for putting up with me lol. they have never caught any diseases (knock on wood) and i will have had one of them (my first one) for a year in january. that fish is the only one of my original fish i have left. i would reccomend them to anyone starting a tank.
 
I have to agree with black skirts as well. My black skirt tetra has always been alone and he is my oldest fish at 2 years old.
 
I'm going to have to say Tandanus catfish. My Geoffry started off being put in a 5 gallon with a baby barramundi (RIP Desmond </3) with no cycle, having the filter scrubbed when I thought it looked dirty nearly once a month, living in unbelievable ammonia, nitrite and nitrate concentrations, temprature fluctuations, surviving a barramundi attack, being put into another uncycled 5 gallon with 6 platies, survived ich, got put into my cycled 40 gallon, banged his head on the glass when he was having a spaz when I turned the light on and swan upside down and sideways for a few months, same thing happened but he went back to normal, he has been stuck in countless places in his tank, and now he is still in that well filtered, planted 40 gallon with plenty of good food and lots of nice river sand to nomnomnom around on and soon to be put in a 55 gallon with the rest of his tank. Geoffry was the second ever fish for a 'proper' fish tank I had ever gotten, Boxing day 2009 and is the last of my original fish to still be alive :)
 
White Clouds.

When I got "hooked" again on the hobby a few years ago, it started with a friend giving me a goldfish bowl with a few White Clouds that lived in the most horrible condition. The kids grew tired of their aquarium and the only fish that survived were some White Clouds. When I took the bowl home I could barely see them in the dirty water.

I bought a 20 gallon for them and they thrived. After being in the new tank for a short time they spawned!

I vote for the White Cloud as the hardiest fish.

And to this day I still have some decendants from the originals!
 
Another vote for Black Skirt Tetras here. I've had them for so long, I've forgotten when I bought them originally. They will live through almost anything.
 
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