Thank you for the join! I am new to salt, and about a year into keeping fresh ...too many tanks to mention! First salty dip is a Dynmax IQ9 step. Live in Australia. Started tank with heap of live rock (lots of wonderful critters came out ...wow), few peppermint shimp and just added some xenia and green star polyps. Wondering if I should add a lid? Any ideas? Evaporation seems pretty hard core.