So you've set up a predator-free environment and left it to simmer with optimal heat and moisture for tropical arthropods to reproduce. You've now gotten a boom of one of these critters - without seeing damage to your plants.
A bioactive viv is gonna be bioactive. A viv without macro-predators will support huge populations of critters (like springtails and mites) that are normally prey. Detrivorous mites are harmless and frogs eat them (if you ever add some).