I'm with Kiran on this, but ADA can get really expensive really quickly. That's the main reason I don't have one right now (though, I do plan on building up cash to do so in the future). I just got an Eheim Aquastyle 9 that I love so far. Shop around online, as you can usually find it for under $110. You can also order extra lights from Eheim for about $50 apiece should you want bright lighting instead of medium. If you go for the Aquastyle 6, you have no need of extra lighting, but I like the size of the 9 gallon (12x12x14).