No do the test now before the water change. otherwise you'll have incorrect data. for example, IF the issue was, this is hypothetical, high nitrates and you did a water change then did the test the parameters would rule out nitrates because the nitrates would be lower. follow? best of luck
The symptoms are to problem I noticed, then the fish dies within the day it is swimming upside down.
Symptoms:
- yellow green hue on their side, where the stomach is located.
- swimming upside down
- swimming upside right under the surface
Water parameters I don't know off hand would have to do a test now. I want to do another large water change today, so after that I would do the test/