If you are running a reef tank you should also have an auto top off. There are a ton of options when it comes to purchasing an ATO, I decided to go with the JBJ ATO. It is very common in the hobby and it allows you to flip float switch 2 around which will shut the ATO pump off if the water raises this float switch. If you are not running an ATO your skimmer can run inconsistently. Last running an ATO will allow you to leave the tank for days or weeks without worrying about burning your return pump out when to much water evaporates.
Maybe the most important factor is the fact that Auto Top Off's will stabilize the water, if there are salinity swings they will be minimal!
Maybe the most important factor is the fact that Auto Top Off's will stabilize the water, if there are salinity swings they will be minimal!