Depending on the cfm requirement of the discs and the pump cfm capacity you may be able to simply slow the verticle lift down by bypassing or exhausting some of the air off prior to entry into the airlines . Your compressor may be too large for two stations to meet your goal.Consider finding out how much lift you are getting on a GPM basis with each station before slowing them down as too little lift can simple "hangup" nutrients in the water column and cause other growth problems.Your lift per day should not be less than .75
