rio's are known for pooping out sooner then the MJ. I would do either do a MJ 400 or 600 depending on what you want to keep in the tank. For sps you want more flow so i would go with the 600. For mainly softies and LPS i would go with the 400.
I just put a maxi jet 600 with a hydor flow in my JBJ 6 cube and its perfect. I swapped out the stock jbj pump cause it ran to hot! I now need a heater to stay at 77 degrees.
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