Have a 10 gallon tank (and of course now I'm reading that I prob. should have started with something bigger but I'm not overstocking). Anyway, the way the tank is set-up (inside a hutch), it's hard to adjust the current Tetra Whisper filter. I'd like to eventually get a bigger tank and I hear good things about the Fluval external filters (105, 205, etc.) I understand you can understand the flow rate so I was thinking (esp. since local pet store only sells 205 and above) to get the 205 and limit the flow rate? Thoughts? Thanks!