I don’t think I ever explained the water change system on this tank. I have a 20 gallon high tank that is gravity fed through a solenoid to the sump of the 265. I have a heater and powerhead in the water change tank and I add salt to this tank every day after I do a water change. The water change has gotten a bit more complex since we added our frag system but I will talk more about that in another thread. I drain 10 gallons from the sump through a hose and then I flip a switch and 10 fresh gallons drains from the water change tank into the sump. The water change tank is automatically filled through a solenoid off the RO/DI unit and float switches. Having this automated system makes doing water changes a piece of cake and actually possible. I can't imagine how long it would take me to do a 10 gallon water change a day if I had to manually fill buckets.