You should add powerheads, but you won't need a lot of flow as it is fish only. Vortech and Tunze are considered top of the line, but for what you are doing, Koralia's would work just fine and be considerably cheaper. 2 Koralia 1400's should be good for your set up. I used to run 2 Koralia 3's, but have had to add more powerheads to my system. There are a lot of different options out there to consider. The magnet's for Tunze, Vortech and Koralia are all nice though for positioning your powerheads.
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