How do German blue ram cichlids inseminate or how do the eggs become fertile Im conducting my own research into this fish?

German blue ram cichlids are egg-laying fish that engage in a spawning process where the female lays eggs on a flat surface, typically in a secure location like a leaf or a substrate. The male then fertilizes the eggs by releasing sperm over them as the female lays them. This external fertilization method ensures that the eggs become fertile shortly after they are laid. After fertilization, the parents often guard the eggs until they hatch, providing care and protection for the developing embryos.