Hi, I changed 25 gal out of my 56 gal tank yesterday my oranda is not acting well, he is sorta staying in one corner of the tank in the bottom. Swims slow just not acting normal did I change to much, I had been taking 15 gal out each week I figured a 25 gal change would be good to get some fresher water in the last 15 gal water change went good this time after 15 it still had some stuff I wanted out so I took 25. Have I killed my oranda???

