(Parasites) Tiny "flea-like" bugs in substrate in WTF tank?!!!

[Raiden]

No.

Having small invertebrates crawling around in your house would be alarming to you, because you are a human, and having those kinds of things in your house often indicates a cleanliness issue.

However, if you think about the fact that many treefrogs live in rainforests, where there could be hundreds of tiny invertebrates in just a cubic inch of soil, you shouldn't be so alarmed. Frogs do not get fleas or other arthropod external parasites to my knowledge, or at least they do not get them frequently. If the creatures in your tank are mites, then you might need to change the substrate out, but a well constructed tank will often have some kind of small invertebrate community in the soil that can help to keep the tank slightly cleaner biologically.

Many people who build vivariums for dart frogs and other smaller treefrogs often inoculate the soil with springtails and sometimes with detritivorous nematodes. The springtails are harmless arthropods that break down dead leaves, feces, and leftover food items with gusto, and the nematode worms perform a similar function.

[Badger]

No.

Having small invertebrates crawling around in your house would be alarming to you, because you are a human, and having those kinds of things in your house often indicates a cleanliness issue.

However, if you think about the fact that many treefrogs live in rainforests, where there could be hundreds of tiny invertebrates in just a cubic inch of soil, you shouldn't be so alarmed. Frogs do not get fleas or other arthropod external parasites to my knowledge, or at least they do not get them frequently. If the creatures in your tank are mites, then you might need to change the substrate out, but a well constructed tank will often have some kind of small invertebrate community in the soil that can help to keep the tank slightly cleaner biologically.

Many people who build vivariums for dart frogs and other smaller treefrogs often inoculate the soil with springtails and sometimes with detritivorous nematodes. The springtails are harmless arthropods that break down dead leaves, feces, and leftover food items with gusto, and the nematode worms perform a similar function.

Yes, springtails are beneficial, but they don't just appear out of nowhere, you have to introduce them into the tank. If you haven't done that, or used any soil/plants etc you wouldn't have them. Mite's are more likely. A vet check wouldn't hurt, but if they are gone then I wouldn't worry too much unless they come back. Mite's can be harmful to phibs, though they can also be a snack for frogs.