08-22-2011, 12:15 PM
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Danios are energetic swimmers and need to be kept in groups. Given that your tank is taller than it is longer, danios might not be a good fit for it.
It sounds like you're a guppy fan so you could have a nice group of all male or all female guppys if you don't want fry all of the time.
You could add a small school of corys for the bottom too.
Guppies are more tolerant of water params but check your ph and hardness to see if corys would do well in your tank. You can check them out in the fish profiles at the top of the forum page - second from left.