Euskirchen Excuse me, what is this?

Euskirchen Only a week after opening the cylinder, there are a lot of green silk things growing on it. Excuse me, what is this? what should I do with it?
Euskirchen Straw jar small white note comment: there are 50.
Euskirchen Grass jar small white note comment: don't just tease me, tell me how to solve it.
Euskirchen E8bChz8z comment: algae
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