As we told at other places here in the website of the P-P or in the Finke-Hallmann-book, there are many different methods that have proven to be successful. The Bussler-method of taking the cave with the eggs or the young fry is only one, you can do just the opposite (take the adults out) or even leave everything at its place. The latter one is the most easy and interesting method, but a bit risky as long you do not know how the special pair behaves. But one should test that out. If they spawned once, they will spawn a second and a third time if good conditions prevail. It may go on for weeks. However: Do not think this will go on for months, and thnking next year they will spawn as they did this one maybe wrong. The causes why this may not be the case are not fully clear by now. It is a good advice to grow some offspring up as early as possible.
If you separate the clutch from the father, you renounce of the father’s care for the eggs and later on his care for the young larvae. This is by no means without meaning, especially in the small tank with stagnant water and nearly always many germs. Mostly, a part of the eggs fail to develop, become white and die and infect others. This is prevented by the father’s care very efficiently. So, Bernd’s method is possible, but do not part them too early.