It's not just the fact that there isn't enough oxygen, fish need room to swim. That's my biggest beef with a hex tank. Think about it. A fish swims back and forth, not up and down. Length is ALWAYS better than height, at least if you have the animal's best well-being in mind. Long tanks are much better than tall tanks.
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current setup:
5.5 gallon low-light planted tank
-nothing....thinking a mini-community.
for reference: my name is Julie 
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