Fish for an Idiot

Cories are pretty sensitive to water parameters, I wouldn't throw them in.

Most species are, however, C. aeneus (bronze) are pretty hardy IME. Others, arent always great starter fish. You could always try subbing a bn plec too...
 
speaking as an idiot, I agree that you should find the fish you want to keep as a starting point, get the right size tank, and it will all come from that.
 
I don't consider danios to be all that hardy unfortunately. I think they tend to be too inbred and sickly. I lost 5 of my original 7 danios pretty quickly...although the two survivors are still doing well.

In contrast, I've had good luck with Gold barbs. They are very active and a bright, pretty color. They're also peaceful community fish - not nippy like tiger barbs!
Serpae tetras are also very hardy in my experience. BUT they are nippy (I had a school of six, which I thought would be enough to keep the aggression down, yet they still harassed my cories and paradise fish to the point that I had to separate them).

Paradise fish are pretty hardy too for that matter. They are considered coldwater fish so they don't really need a heater. The only downside with them is that some of them are aggressive (though mine got along with all my other fish except the serpaes!).
 
Beta fish we have one upstairs in my sons room it's quite ancient!
You could make a lovely scape for it and that could be more of what you do with your tank and then plop a Beta in and it will look lovely you could change it around from time to time if you get bored.
 
Convicts are probably the hardiest fish I have ever kept. I remember when I was young (a long time ago) we had a tank that was left for over a year with everything still in it and no filter running (we thought it had no fish). I finally decided to clean it out and found 3 cons still living in the water that looked like mud. That said, I wouldn't get any fish I was not going to look after their needs properly. Get a dog that can poop on the floor and let you know you have to clean it. It will "hound" you to feed it. Fish are at our mercy and can sometimes be hard enough to keep when doing things right.
 
I'm assuming you will provide good basic maintenance. My experience suggests barbs (either gold or rosy) are pretty well bullet proof fish. While livebearers and convicts are probably just as easy, the population can spin out of control pretty easily. My rosy barbs have never had a problem with lower temperatures, (I'm afraid I've forgotten to plug the heater back in too). That said you can run into poor stock with just about any species. Also keep in mind, an understocked tank is always more "easier" then an overstocked one given the same level of maintenance.
 
Back in the day it seems like I couldn't kill Gourami's if I wanted to. They live forever.
 
white clouds get my vote, beautiful schooling fish and do well at just about any temp. just keep them in tanks 20" long min and have no more than 1 per 2g, if you have just white clouds stocked at that level you're looking at feeding every other day, WC every 2 weeks(as long as you're source water is pretty good, should keep nitrates under 20 idealy but 30 is about as high as i'd recommend) and no heater needed, just a ton of water flow(they're stream fish and love the current)
 
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