im having trouble matching the pump to diffuser. the pump pond master 100 9150 cu in/min 6.5 psi. the diffuser 2 5/8 in round 30 in long membrain flow interference 14 11/16 gallons mixed/hr @6ft depth per cfm air input 10.8 air requirments 3-15 scfm. one is measured in gallons per hour and the other cubic inch per minute. pump is psi and diffuser is scfm. do I need to convert psi into scfm I don't think that is possible it seems to me the diffuser will handle up to 4 psi so is this pump to much at6.5 psi?