Are you saying I should remove half the water and then add water back in that's warmer than the what's in his tank? Or lower it to about a 1/4 full and then fill to halfway with warmer water? And then would I be adding in my new heater to regulate it at a warm temp? (The new heater is adjustable and has a minimum water line so I'm worried about having half the water in the tank gone.)
That site is one my favorite snarky responses. As for the bubbles from the gills they are definitely the bad not normal kind which is what I found in most of those results when I looked for them on my own. There was only one response that seemed similar to my situation and their's eventually passed away.