Yup definitely stress response, good sign the mouth closes when you change water. It’s getting enough light right? Keep us posted, great thread and hope the treatment works!
It’s under my kessil I only have it peaking at 30% intensity on the 10 gallon. I figured it went from being on the bottom of the DT with the light mounted over 8 inches off the water. I didn’t want to risk shocking it with too much light. However on my DT it was peaking at 90% intensity with 4x T5HO bulbs to supplement.
