Tunze streams are very reliable and very quiet. They run for quite sometime before cleaning is required. I would go with the DC option. If you get them properly sized you can probably get away with 4. I would suggest getting a 7096 controller with them as well. It will give you a lot of variable flow options. The Stream 3 looks pretty amazing but I'm not sure how well your tank configuration would hide it. I would pose your question in the Tunze forum. Roger Vitko is the USA rep and he could tell you exactly what configuration would work best for your setup.
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