ahh ok, with a crushed coral you could get away with 6060's in that tank but I wouldn't go bigger or your crushed coral will be in a pile in one corner
I run a mix of SEIO and TUNZ in my tank as I use the tunze for main flow and the SEIO to put more direct flow in specific areas. you could always replace your power heads with the 820 SEIO's and then laiter add a tunze.
Steve
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