Tetra® aquarium products are dedicated to helping seasoned hobbyists and beginners alike enjoy a successful, life-long aquatic experience. Tetra products build fishkeeping 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 reward. Dive into a world of scientific discovery with the Tetra® 3-Gallon Crescent STEM Aquarium Kit. Explore the science behind fishkeeping, including biology, chemistry, physics and mechanical engineering, through hands-on activities in the activity guide. The seamless aquarium features a unique, 3-gallon, curved-front tank for unobstructed viewing and is illuminated by energy-efficient, bright white LEDs hidden inside the low-profile black cover. The kit includes the Tetra Whisper® Internal Power Filter, a small Bio-Bag® Filter Cartridge, four test strips, a thermometer and a Tetra® STEM Kit Activity Guide. Perfect for a kitchen, bedroom or living room, this aquarium is a great way to understand the science behind fishkeeping. Not intended for children under the age of 13. This is not a toy.