I currently have two 10 gallon tanks and in those tanks I have a filter pictured below. Problem is, it's a piece of junk as I'm now learning (it came with the 10 gallon tanks). It's very difficult to service and it cracks very easily. I want to change to a new power filter. Since they are 10 gallon tanks, I'm thinking of going with the 'mini' filters. Would you recommend the Penguin Bio-Wheel Mini or the Hagen Aquaclear Mini? (Or anything else?) Also, since there is a lot of bacteria on the current filter, how would I be able to transfer that bacteria to the new filter?
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