The buyer must ensure that the goods are securely and adequately packed to avoid damage and the purchaser pays return postage costs. Orders under £49.00 are dispatched via Royal Mail Tracked 48. Our dedicated industry trained team of staff are on hand to answer any questions or queries you may have. With over 40 years of experience in the design, installation and maintenance of ponds, water features and aquariums in all shapes and sizes. Based in Stockton on Tees near Middlesbrough, Pond Planet has fast become one of the UK's leading online retailers of aquarium and pond supplies. The API Ammonia Test Kit provides a vital measure of ammonia levels between 0 and 8ppm. Uneaten food and decaying organic matter also add ammonia to the water. Fish continually release ammonia into the aquarium through their gills, urine and solid waste. Ammonia is the number one killer of aquarium fish - even small amounts of ammonia can cause stress whilst large amounts of ammonia will lead to fish deaths.