my problem with the linear air pumps are large drops and deep tanks I run an alta 60 on 23 tanks works really well on the top and middle row really poor on the bottom row about an 8 foot drop. I cant speak to that specific pump though.
Im with Dan On this one, I have the same as him and it does great on my 25+ tanks on a closed loop, but on the bottom tanks or the lower tanks that are the farthest from the pump, I have to raise the filter up on a flower pot in order to get it to pump air.
I noticed you said stones, if you are using air stones that will really cut down on the amount of air being pushed thru the system. I run all sponge and box filters with no air stones because of this reason