Hello. Your plan is a good one. You can keep your red eyes in a quarantine tank while waiting for the silicone to dry and cure. Do you have any extra tanks?

If you rinse the plants, bake any natural wood at 325'-350'F for 30 minutes, rinse down the tank, change all substrate (leave bare with no substrate when using the dry ice), and use the dry ice you should minimize if not rid of all pests.

I prefer only using springtails and isopods. Centipedes love to hide up in substrate tangled within plant roots. Be sure to rinse them well.

It seems you have a perfect ecosystem for them all to thrive in there (insects). Unfortunately they can be a nuisance.

90 gallon is a nice sized tank. What are your dimensions?