this is what his looks like
it looks like all you get is a straight airline into a venturi hole. that power head looks like one on a DIY CO2
reactor someone gave me, and if it is the same, it won't have much suction power to really pull air through.
reactor worked because CO2
was being pushed thru the airline, and then grabbed by the impeller.
all I can think of is to try adjusting how much airline is pushed into the pump to see if that helps it pull air in.