They are open spawners. What that means is they will spaawn anywhere in the open, and not in caves, etc. They spawn in pits they dig, on flat rock surfaces, and leaves of crypts, swords, anubias, etc. Once they start spawning, they usually don't change habits. I have another pair laying eggs right now. I had moved a granite rock to their old spawning site, now they moved to another location and dug another pit, lol. Can't get them to spawn on the granite, lol. It's all in the fishes minds I guess, lol......