she should start to get ready to breed again in 3-6 weeks. depends on the fish. have one pair that usually breeds about every 3 weeks and the other that is a lttle longer.
if you are going to put them in a seperate tank, i would do so now. the female will clean a flat surface on which to lay the eggs. you will notice her belly getting a bright orangey color. the orange color may even go up in to the body area. one of mine almost gets all orange before she lays, but she is a pink. also her belly will get very large. you may notice the oviposter a day or two before she lays the eggs.
would seperate them now so they can prepare where they want to lay the eggs.
semper fi