Suggestions?? Umm match the temperature better!!! Haha. Kidding.. but seriously.. I have sensitive fish, no room for error with this stuff. I set up a couple 55 gal
brute barrels. They run all the time bit you could use yours as needed. Get an air stone and a heater. Just fill it a day or two before you water change. Youd need a pump too. Could be more than you're willing to invest. You could also get an inline digital thermometer, they're meant for shower heads. @coralbandit uses them I believe. That may be the best option.