20 Oxidus gracilis Millipedes

Millipedes aren’t bad when given enough supply of leaf litter and decay bark and used together with isopods and springtails, their role in a bioactive terranium is to serve as “decomposers,” feeders on dead plants and decaying wood. Use in medium to large terrariums. 

The only millipedes that will actively go after live plants are   long as you supply leaf litter and decay bark they’ll be fine. Having a very active culture of springtails and isopods to aid in waste cleanup will bring the bioactive loop you are looking for.