i know exactly the tank you're talking about. definitely do not keep tiger barbs in there, it is MUCH too small. when i worked at petc0, we sold them, and i had to constantly discourage people from buying them. there's very little you can put in there, other than a few shrimp or maybe some VERY small fish. cylindrical tanks offer practically no surface area, so the oxygen content of the water is very low. not to mention that fish really swim back and forth rather than up and down.
to those who don't know what i'm talking about, this is the tank here:
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current setup:
5.5 gallon low-light planted tank
-nothing....thinking a mini-community.
for reference: my name is Julie
