Just my opinion but i would ditch the hang on filters because i would be scared of them filling with crud and go with the mp40(or something with similar flow) and just shoot for lots of random flow .With the open rock work and lots of flow ,thats the best biological filter . I was using alot of rock and 2 koralia 1400 in my 55 with too many fish and nitrates and phosphates never went over 0 and i got great growth from my zoas , acans and other corals.
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