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In very severe cases
7 L) of aquarium water once each week
This will strengthen their immune system
The calibration procedure is very simple and fast
API Aqua Essential Size:237ml In very severe casesAQUA ESSENTIAL water conditioner is a highly concentrated all in one water conditioner that instantly makes tap water safe for fish by removing chlorine, chloramine and detoxifies heavy metals commonly found in tap water. AQUA ESSENTIAL water conditioner instantly removes toxic ammonia, nitrate and nitrite levels in freshwater, saltwater and planted aquariums. Toxic ammonia continually released by fish through their gills, urine and solid waste.