How soon should I leave it

My male bristlenose kicked out the eggs and I`m wondering how long should I leave it before I try and trigger another spawn

When you talk about lowering the temp of the water. How long do you leave the water around 22c. Last time I just poured in cold water in everyday until the spawn but I left the heater set at around 25c. Should I leave the heater at 22c and cut down on cold water changes

Thanks for any help