Exeter Excuse me, what is this?

Exeter 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?
Straw jar small white note comment: there are 50.
Grass jar small white note comment: don't just tease me, tell me how to solve it.
E8bChz8z comment: algae
Exeter
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