I fill in one third (approximately 3 cm from the bottom), one third of the kettle that has cooled down, and add water from the aquarium to the level with the mark.
Ngigcwalisa ingxenye eyodwa kwezintathu (cishe amasentimitha ama-3 ukusuka ezansi), ingxenye eyodwa kwezintathu epholile eseketeleni, futhi ngifaka amanzi asuka ku-aquarium aye ezingeni elinophawu.