Reducing pump output

I have a Bubble Blaster 1000s that I use for CO2 diffusion in a planted freshwater tank. CO2 is fed into the venturi of an octopus bubble blaster 1000s needle wheel pump. The output goes to a 20” cerges reactor that then that output goes to the input of the main sump pump. I need to slow down the pump in order to increase the dwell time of the CO2 in the reactor. Will it damage the pump if I put a a ball valve between the output of the BB and the reactor in order to decrease the flow of the output from the BB?