Cycling and a quick Q

[melosu58]

Seaham is right on the money. I have a mark on my sump and I keep the water level. Remember that only water evaporates. Your salt stays in the tank so you want to add FW to the line to replenish the FW. I do mine daily

 

[roka64]

I just fill mine up to the same place, the bottom line of the top rim.