So something I have been noticing. I have somewhat of a die off every time I change water. Usually affects my plecos, Cory’s, CPDs the most. I notice my honey gouramis will go towards the surface to try for oxygen I am guessing.
What could be going on. My tank is pretty well established and my levels are clean (I know take that with a grain of salt) I more clean my tank and water change just as a weekly maintenance.
Some notes I have hard water, my temps are around 78-80, and I refill the tank from a hose outside my door. It’s happened a few times now let’s say 4-6 and doesn’t kill the whole tank but seems that certain groups are affected. The plecos and gouramis tend to pull through but struggle for a bit. Tank is a 75gal.
I have two air stones running as well as a flow bar part of my filter system.