It really is trial and error. I moved my two power heads three times each before I got it right. I used some flake food to feed the tank a few times. The flakes stay afloat in the currents better and allowed me to identify dead spots. You will want to address any dead spots you find over time. I've found that angling the power heads up and towards the front glass made the most of the two power heads in regards to overall water movement. I'm still debating a third one.
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Work in Progress:
75g Rimless DT | 20g sump | Aquamaxx ConeS-1 | Two Tunze Turbelle 6025
Tank established 02/16/14
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