[quote] Put them on an on/off timer to create random flows. That way you will have 4 currents for the price/heat of 2 PH's[quote]
Thats a great point about the random flow.
As far as two powerheads vs one...IMO
flow is flow and the skimmer does create a current in the tank, so it could count as part of the gph
, just like you would count the flow from a sump as part of your flow equation.
I was just worried that in such a small tank, 3 pumps (skimmer plus 2 PH) IMO
seems like a lot. Maybe those zoomed PH just create a lot of extra heat.