Was wir in der Krise lernen könnten (25)

Drinking Aquarium Water does not cure COVID-16. (Source)

It may be referring to the consumption of the drug chloroquine which is sold for the treatment of various fish infections. Consumption can be fatal!

Chloroquine is not the same as hydroxychloroquine, but both seem ineffective at treating COVID infections.

By the way, tonic water doesn’t either as it contains quinine, not chloroquine.