Roger30
Premium Member
I have a AIO rimless 30 gallon that has up and running for 9 months now. My goal is to get keep my salinity at around 1.025. However for the last few months my salinity has been around 1.023. I buy my water and do a 50% water change every other week. I tested the water I purchase and it's salinity is 1.025. I have ato system with a 5 gallon reservoir that last me 15+ days. Any ideas why my salinity level keeps dropping?