Hi! I’m new to this site and saltwater in general. I’ve kept 3 freshwater tanks and currently have two right now. I decided to setup my 10 gallon tank for saltwater. I’ve done lots of research to make sure I do it right but I still have some questions. When I’m trying to get my salinity just right. Is there a rule or thumb to add freshwater (after evaporation) to balance out the salinity? Also can I use the same type of water I put in my freshwater tanks or must it be distilled water? Thanks!