hey alopez,
from my limited experience I think you are doing fine. You have given it good substrate. These springtails will have come from somewhere. My bet is from the flower shop the orchid came from.
Like your research has indicated springtails are no harm to your orchid. They are extremely simple creatures and dryness kills them. So don't worry about them for now but in a few months time ideally they should go away and the best way is to keep the pot a little drier but never let the roots dry completely. With orchids you just have to find the right rhythm, once they have dried you water and repeat the process. Don't wait too long that they get stressed but don't water too early that the springtails keep having lots of water.
Same for the cracks, they happened, most likely at the flower shop and the wetter they are kept the faster they will decay. You can't keep them completely dry because the plant needs moisture but just let the cracks dry well and keep them dry so they last as long as possible. In time the orchid will grow new roots, adapt to the new media, the springtails will run out of food and things will turn around.
The main criteria is not to overwater, don't let it dry excessively give it the care a phal needs, light, the right temps and a bit of fertilizer and the plant will usually grow by itself
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