Is the rock cured already?
Yeah, the first looks like a copepod, and the second is definitely a flatworm. You will likely have flatworms as long as you have pods for them to eat. But your pod population will fluctuate, so nothing to worry about yet. If you get the flatworms with red on their back then you'll have to deal with that issue, but this one looks like one of the harmless ones (at least harmless in small populations).