Okay guys narrowed it down...
for a 150 SPS with heavy bioload which would be better..
Alpha 200 ( was told by Jeremy @ PA that it was to big )
Alpha 170
ATB 840
if you heavy bio load and you feeding heavy or want to feed heavy take the biggest..... as much as more water/air will run into your skimmer you will get better skimming result .....if you can afford that go with the biggest.
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