Ksupermnp
I have two in my 40g breeder and would not run two if it wasnt a fully stocked SPS tank. The 900 with the Octura 1435 is estimated at 1500gph.
Frezel
If it is spinning in the wrong direction constantly that is usually a sign that the prop is too big for the motor or there is to much drag. Try to make sure everything is centered and if it is, then try cutting the prop down slightly and it should correct itself. I have had to do this a couple of times on some of mine
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