So I am bringing this thread back, as I am still unable to keep cheato alive. I came across an issue someone else was having with their cheato in which he found the cause. According to him his ATO was pouring RO water in the chamber next to his cheato which was causing frequent hypo-salinity in the refugium. The hypo-salinity was killing off his cheato. I was wondering if maybe the same is happening to me, as I just cannot understand why I cannot keep cheato. What do you guys think ? Where do you guys have your ATO pour your RO for top off?