Not sure what you mean by raising the Sweeter Heater up one round. We have Sweeter Heaters and their S-hooks had to simply be connected to something to raise and lower them. We used hydroponic grow-light cables: click the button to adjust how much higher or lower we want the heater to be, even a centimeter if we want. We started out using link chains, but an entire link would raise or lower the temperature too much. If you're using chain and you've noticed a change in how your chicks are reacting to the heat, then put it right back where you had it. The chicks will let you know when it's the wrong temp for them, better than any thermometer or any book about chicks. And if you have a hydroponics store near you, and you're serious enough about brooding chicks that you got a Sweeter Heater, consider getting the grow-light cables. They're much, much better for minute adjustments of the heater than chain is.