Originally Posted by spoonman
How could the salinity go down if you are adding saltwater to the tank? I have been told to top off saltwater tanks with RO
water and no salt. What is true?
If you do your water change with salt water that is lower in salinity than the water you just took out, your salinity in the tank will go down. And yes... top off EVAPORATION using RO
As far as matching PWC
water salinity to your tank water... you should be able to match it dead on if you keep some mixed saltwater stored somewhere with a heater and powerhead in it. By mixing in advance and storing it, you can check the salinity and adjust it all you want until you're ready to use it. Eventually you'll find the right amount of salt to water that will give you exactly what you want. It's always good to have extra water at the right salinity and temperature ready to go in case of emergencies.