Suggestions for a new tank

[Leeny]

I'm trying to convince my parents to let me get a second tank, and I just want a small one. Nothing more than 20 g. I saw a 14 g Biocube at our local Petco and I was wondering if those are good tanks? Thanks!

[warped1]

If this is one of those tanks that are self contained with a filter system built into it I tend to shy away from them for two reasons
1 - if the built in filter should break replacement parts are pricey and somewhat difficult to install
2 - I feel you are limited in filter media whereas on a HOB like AquaClear or Whisper you have more room to get creative with your media for the best possible filtration. And replacement parts for these are reasonable