Looks like a bacterial bloom from the new substrate. I understand you added new Ada Amazonia. It will go away once the food for it is gone. How much water did you change after you added the substrate?
New Aquasoil will bring more ammonia so I would hold off adding any new fish or shrimps.
Most snails are not a problem for the plants just a visual nuisance.
The plant in the last photos (Anubias sp) need to have the rhizome(green horizontal fat part from where the leaves and roots come from) above the substrate.
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On hiatus till later this year