API AQUARIUM START UP PACK contains two helpful treatments to make your water safe and livable for fish before adding them to your aquarium. AQUARIUM START UP PACK contains API STRESS COAT water conditioner and API QUICK START nitrifying bacteria to dechlorinate tap water and kick start the natural aquarium cycle. For use when changing water or adding fish for the first time. After dosing with these two products, your tank will be safe for your fish!