Omg... Brian holy cow... you were right! This morning its' sail came back up and it swam around fine. No more sluggish movement and on closer inspection I saw a slight scratch on it's back where the fin had previously been draped over it. It must have jumped and hit something. Now I have to see if something spooked it or it just jumped for no reason.
This would be an interesting case on the drop eye theory. If silvers get DE from jumping and injuring itself let's see if black Aro's will get the same.
Do you know how many times has it jumped before? How big is your Aro ATM?