I'm getting a larger desk at work, which means that after all these years, I can finally set up a small desktop aquarium. I'm thinking a 2.5 gallon glass tank (12 x 8 x 6") with a betta and lots of plants. I'm just not sure what I want to use for filtration. I'm looking for cheap. I'm thinking either a small internal filter like the Tetra Whisper, or maybe the good old Lee's corner filter since it allows me to customize my media. I'm open to the idea of a sponge filter or anything else. What do you all use/recommend? Or should I just scap the customizable stuff and get a mini bow?