03-20-2007, 10:19 PM
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A six gallon tank is 48 lbs of water, probably 2 lbs of tank, and you can add maybe half the wieght of the substrate and decorations (since you're displacing water with that). Most desks will hold 50 lbs no worries.
You can have a small shoal of 4 to 6 small cories (C pygmeus, C. hasbrosus, C. hastatus, or C. guapore) in a tank this size. That's it, though. You could have a small shoal of small tetras, microrasboras, or white clouds. Up to 3 male guppies or endlers. A pair of Sparkling Gouramis.
I recently set up a single male betta in a 5.5 gallon tank, and he swims around it constantly. Looking at how he uses all the space in the tank, I have pretty much decided that he's going to be the sole inhabitant. (I had thought about adding a trio of ottos, but they'd not be able to get out of his way.)
If you can get them, moth catfish will work in a nano tank - but that's not at all the kind of fish you are looking for.
With the 6 gallon, I'd go with either 3 male guppies, or 1 male betta for color and movement. If I were more interested in a perfect planted nano tank, I'd go with Red Cherry Shrimp and microrasboras.