An event every year that begins at 00:00 on day 18 of June, repeating indefinitely
When: June 18
First occurrence: .?.
You shouldn’t need a holiday to clean your aquarium. You need to do a serious deep cleaning of the aquarium and profusely apologize to your poor pets.
If you do clean regularly, do a little cleaning anyway to make the inhabitants happy.
Either way, think of a way to make cleaning up easier.
To make life pleasant for you and your precious wet pets.