I have heard females have been moved to male temp to speed the hatch. I am just curious if anyone has moved their male eggs after 3-4 weeks to a cooler female temp?
I know that sex is determined in the first 3 weeks...Many people raise the temp once the female sex is determined, to make the colors brighter in the female. I am not sure about making the eggs hatch faster. I breed angelfish as well and I keep the temp high to have a quicker hatch. It may be the same thing with leos. If the temp is turned up past 91 degrees, there can be fatality or "hot" females (females that are acting like males-may be infertile or too agressive to breed)
I would highly recommend not moving eggs either way. Leo eggs should remain at a consistent temp through the entire incubation period. Inconsistent or spikes in temps can kill embryos or cause deformities with hatchlings.
To answer the original question, there is no point to take a male incubated egg and then move it to female temps. This will just cause it longer to hatch.
When it comes to colors and incubation temps, this only becomes an issue when you are working with tremper albinos. No other morph has this issue.
Matter of Fact i do, With Females, i keep them in the Female Incubator for a month instead of three just to make sure they are temp sex for Female them move them to the male incubator for the remainder of the time. Some say it causes deformities but out of 200 eggs i got 1 deformed gecko, it was a mack snow and its tail was shorter, but it was not because of being moved from 1 incubator to another!
Moving eggs from a higher temeprature incubation to a lower temperature will make them take longer to hatch, otherwise there is no purpose in doing so.
Temp spikes are dangerous to the developing fetus. I do not know if the same holds true for temp drops. As mentioned before there is NO advantage to taking male incubated eggs and then placing them in cooler temps. This will just cause them longer to hatch. By keeping them at male temps they will hatch sooner.