For 50 year, fishkeeping enthusiasts have looked to the Tetra name for products and solutions that add ease and beauty to their home. Whether you're an experienced hobbyist or just starting out, Tetra has everything you need–-from a large variety of quality fish food and innovative equipment to test kits and decor. Tetra is a name you can trust in the aquatics industry. With decades of proven performance and high quality products it’s no wonder Tetra is the go to brand for aquatic beginners and veterans alike. AquaSafe Plus Bio Extract formula contains seaweed extracts (natural biopolymers). The added ingredients help to reduce aquarium pollution. As always, AquaSafe Plus water conditioner makes tap water safe for fish. Substances in tap water that are dangerous to fish are removed and neutralized with AquaSafe Plus.