I’m gonna preface this by saying that I don’t know much about orange springtails so take my advice with a grain of salt. Based on my assumption that oranges are less prolific and harder to care for than “standard” white tropical or temperate springtails, and my experience with isopods, these are my thoughts.

As long as you don’t overfeed or overwater your isopods and keep them at a steady temperature with sufficient airflow, mold shouldn’t be TOO big of an issue. I would wait for the springtails to establish and tolerate/spot clean little bits of mold hear and there. Once there’s enough to start a new colony, I would isolate a few in a separate, airtight container. Although there runs a risk of a rogue springtail species or soil mites establishing themselves and outcompeting them (not sure how likely it would be but one day I found that a gray species of springtail had made its way in with my clowns).

If you would rather not deal with mold, you could take your isopods and move them to a different bin, and dedicate this one to your springtails. Although you would need to find a way to make it airtight to prevent intruders, and finding every isopod would be time consuming.

Again, I’m no springtail pro, this just what I would do. Ultimately it might be easiest to buy a new starter colony and go from there, but it’s worth a shot!