Internal Filter Recommendations

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Aquarium Advice Newbie
May 21, 2012
Hi guys, first thread on here, just wondering what your thoughts are on internal filters for a 15 to 20 gallon tank, I've been out of the freshwater game for a while, so I'm alittle rusty equipment wise. Unfortunately it can't be a HOB since we have some very inquisitive cats, so I'm thinking a power filter with decent flow output and good surface area media wise.

Tank will be moderately stocked with smaller fish (kubotai rasbora / pygmy cories / lamp eyes / shrimp among other things).
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