I have a Cobalt MJ 1200 on my IM 20, and it is a good fit, quiet, and sufficient flow.
Another good option I have seen mentioned for this aquarium is the Sicce 1.5, which would give a bit more flow than the MJ 1200 (357ghp vs. 295gph).
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7 reef tanks, 5 freshwater tanks, 2 terrariums, 2 dogs, 3 boys, and 1 very understanding wife!
Current Tank Info: Marine: Pair of 40B's, 45W, 50g cube, ADA 45F at home...IM Nuvo 20 and 10 at office!
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