Good to see he is back to normal. Interestingly I have five s.petricola that act very strangely during and after a water change. As though they really didn’t like it and got really stressed. All sitting vertically at the top of the tank after farting around erratically. So I tried removing then adding back the same water and they acted the exactly same. Wasn’t the different water, it was the act of doing the water change.
