Filtration/heating for small tanks/bowls

i'm think of selling my 5 gal hex tank on ebay


as i'm going to upgrad to a 12gal tank to have a commaity with my betta what I want to know is I know betta dont like tanks that rippel or buble to much with the filter so i want to know what would b a good fillter type for my tank ?
 

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