used 29g Bio Cube

[Der_Iron_Chef]

I like these little bio cubes. The only thing that makes a smaller system more difficult is the fact that a lower water volume translates into less stability. If something goes wrong in the tank, there is less water to "absorb" it, for lack of a better word.

But I say go for it! Just read up first and ask lots of questions. And be willing to test your water more regularly than, say, someone with a bigger system might.