What kind do you have now? What kind of things did you do to slow it down? You could easily use the filter in the first pic, just get one for each side. I have used them before on 2.5 gallon tanks and they work okay. The only draw back is that you cannot remove the carbon. If you ever have to use meds, you will have to remove all the filter media.
In my 5.5 gallon I use one of those Whisper In Tank filters. They are round shaped and used the same filter media as the Whisper 5-15 HOB. YOu may look into one of those. They have them at Walmart and they run about $10.
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