You could always try both if you have room for a couple of 6qt sterilite bins to decide which works better for you (or use both together)- The isopods you can obtain locally in the woods, breed them, and keep a constant supply on hand with minimal needs for free and replenish those in the vivaria as necessary. Springtails will cost for an inital culture but are effortless to raise and you can have an infinite supply within a month's time if you move them into a shoebox bin with soil and their starting media and sprinkle some yeast, fish flakes or some other grain based product on them every now and then.
But then again, not everyone likes to keep a variety of random invertebrates. I like to keep a heated rack system at the ready for all my buggies :3 *snorts*





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