Just an update for anyone who is thinking of using ADA Malaya. After 3 and a half weeks my ammonia is finally reading 0. Im not saying that it will be the same for anyone else but its a possibility it may take a few weeks to stop leeching. Many people say Malaya doesnt leech ammonia or say it only lasts a few days but in my eperience it took a lot longer. Various other factors will affect the time it takes such as temp, plants etc but just be prepared if you buy Malaya that it may leech ammonia for a few weeks.