Not Asian, but the real answer is: they’re completely different mythologies, but when Europeans made contact with Asia they decided to use the word “dragon” for the unrelated Asian mythological creature.
It’s generally seen as pretty hard to maintain filter-feeding bivalves long-term in an aquarium tank, in terms of diet (diverse phytoplankton), pH/alkalinity, and substrate (many are pretty specific in terms of conditions in which they burrow). You might have better luck with Corbicula sp. (“Asian clams”) which are quite generalist in their food, even being able to deposit feed by scraping the substrate. They are however quite invasive, so please don’t release them into the wild! Oysters on the other hand are usually found in mostly brackish or fully marine conditions, and would likely not be able to thrive long-term in fully fresh water. Usually they can only survive short bouts of freshening. Source: I study clams
You can offset that by changing the feeding schedule. Just replenish the tank with gray water every other day instead of daily and you should be fine with only four.
Hard to say without knowing its composition. If rich in ammonium, the nitrification (oxidation to nitrate) might lead to lower alkalinity. If rich in nitrate, it might help alkalinity, but only if there’s some lower oxygen area of the tank like a bank of sediment, where denitrification can happen
They are confirmed to be able to gather nano-plastics as larvae, and microplastic as adults, though no studies have looked at nanoscale particles in adult oysters from what I could find. They may ingest the plastic or package it up in mucus to expel as “pseudofeces”, trapping the plastic particles in the sediment. Source: I study bivalves
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