Just set up the Apex, it's been running for 4 days now, I initially set up the conductivity probe and calibrated it with that included solution. Placed it in the tank and it's reading 39.4, check the tank water witha Hannah salinity checker and it reads 35.3. I calibrated the conductivity probe a second time. It reads 35 when in the solution and then 39 when in the tank, I've read a lot of threads where this seems to be a common issue. Does anyone have a work around or a solution for this?