Thank you for your question. The pump is fully adjustable, down to 35 gph. If the fish are having an issue at the minimum flow rate, the issue would be that the fish are ill or stressed for some reason. Make sure the water quality is in good shape with no ammonia or nitrite in it. Test the parameters or have a store do it for you, and do a partial water change.
To adjust the pump flow, unplug it, pull it out of the back chamber, and turn the dial towards the minus sign.
Date published: 2019-03-07