So I had 7 RBTAs all at the same time. Of course I did, they were all clones of each other. The original mother split, then split, then…well you get it? And so they were very accustomed to my routine. Dosing, water changes, light schedules etc. etc. You said you had that deflated one for 3 months. There are two other nems in the picture. Did you have them beforehand or are they “cloned” family members as well? Deflating is something nems can do. Splitting is something nems can and will do. I’m not saying its “normal”. IMO changes in temp, salinity, nutrients all happen when we water change. You did a 50% and he deflated. Cause and affect is pretty much the answer for everything we do in reefing. When we go from 15% to 50% we become a part of the cause. He should re inflate.