Tetra® aquarium products are dedicated to helping seasoned hobbyists and beginners alike enjoy a successful, life-long aquatic experience. Tetra products build fish-, reptile- and pond-keeping confidence, one innovation at a time. Our complete line of Tetra® nutrition, water care, filtration and aquarium products help make fishkeeping accessible to all hobbyists so they can benefit from its rewards. Tetra® SafeStart™ creates a biologically active environment to allow fast introduction of fish into newly set-up fish aquariums. Tetra SafeStart reduces dangerous ammonia in water for a healthy start for fish in all freshwater aquariums. Contains live bacteria that start working immediately to provide a safe environment for new fish. “Cycling” your tank means growing the correct, healthy bacteria on a new filtration system to remove dangerous toxins. This concentrated formula speeds up the cycling process by accelerating the establishment of beneficial bacteria from the start for instant, safe results. FOR SETTING UP NEW AQUARIUMS: Accelerates of the establishment of healthy bacteria in newly set-up freshwater aquariums.  REDUCES TOXINS: Helps remove dangerous levels of ammonia before fish are added. ACCELERATES TANK CYCLING: Helps establish your tank for fast results. FAST-ACTING: Starts working immediately to provide a biologically active environment for new fish without a long wait. USAGE: Treat when setting up a new aquarium. One bottle treats up to 20 gallons of aquarium water.