I've noticed my Coral Beauty Angel hanging out near the surface of the water, last day or two. She is mainly at the top, back corner, b/w the heater & the powerhead. She also has a lighter color spot b/w her eyes, that I hadn't noticed before. I have no other fish. The only thing I have changed(aside from the norm WC), in the past month, is yesterday I added powerheads(2 koralia nano 425's). Before that I only had a babbler/air pump for surface agitation. I have a tetra whisper 30 HOB filter for filtration. I feed seaweed strips everyother day, & feed pellet food every two days(alternate between the two). My temperature has been at a constant 79.5-79.7 degrees F.