Hu that is good to know. So could I use a pump that is rated for 270gph and then use a ball valve at the return part of the pvc to dial it in to the 100gph that you recommend?Because in that chart you posted above the exposure is only 180,000 uw/cm which is for freshwater ich.
Marine Ich requires 280,000 uw/cm as shown on the chart I posted, thus the flow rate is much lower.