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I have a few aquaclear 5000's which put out 937gph each and I wanted to know whether to put them like they show in the diagram with the head piece angled down or should I point it up for more surface agitation? I know the point of a powerhead for piranha's is to move and agitate water, they would get more of a work out if it was down. My other question is do you think those will be enough because for some reason when I try using the air tube no bubbles ever come out. Would it be enough agitation on the water to supply my piranha's with oxygen without air coming through the powerhead at 937gph? I don't want them gasping for air. Nate you seem to have info on this as I see you use rio water pumps which I'm not sure if those are able to flow with air. Please help
