tuckz,

My opinion is that any powerhead will do just fine... the concept is still the same principle... water comes down from the top, co2 comes up from the bottom...

Try to make it so that co2 comes out from the bottom but also not too hard as it might break the plastic... place it in such a way that the water will need to make the maximum turn to get to the next lower disc...

dun worry.. for my dymax, some of the co2 comes out from the top of the reactor where the water flow is the highest... and some is coming out from the bottom of the atomizor...and i am only at the output of 1 bps.

One of the method to see if the reactor is effective is to see if there are any CO2 gasses being released from the reactor.... if it is mixed fully, there should be no or minimal bubbles being released from the reactor..

Well... for mine, those tiny bubbles always get push out into the aquarium and get circulated all over the tank...

Stan