Do you do the water changes by taking him out of the tank? It's best if you siphon off the water that you want to remove, and then add back the temp matched, treated water. It's less stressful to leave him in the tank than to net him out each time.
My Brochs had just enough water to cover his back each time I siphoned off water in his hospital tank. He wiggled around but he was fine and less stressed.
My Brochs had just enough water to cover his back each time I siphoned off water in his hospital tank. He wiggled around but he was fine and less stressed.