It depends on what they spawn on. If they are laying eggs on something easily removable, I pull the eggs. Throw an airstone on them and hit them with MB. Otherwise, I would siphon wigglers. It really depends on what your goals are. If you are maximizing production the sooner, you pull the eggs the sooner they will spawn again. If you just want to watch a few grow up pull the wigglers and enjoy watching them get further through the process.