I purchased the reef octopus ozone reactor a few months ago for my 300 gallon reef and have about 500 gph running through the reactor. I have the controller set to turn off at 350mv. When the unit turns off it keeps rising to about430mv. I recalibrate the probe, put it back in the water and it drops below 300mv. It turns the ozotech back on until the reading gets back to 350mv and it starts all over again. My water is not as clear as it should be using the ozone. Can anyone give me some ideas on what may be wrong?