I am setting up my first salt water tank. i added Dr Tims and Dr Tims ammonia and i also half my media is from an established tank, but after 1 1/2 weeks my ammonia isnt dropping and stay at 2, yes im using API test kit i mention this as ive heard some people say they suck. after just a week the ammonia was at 2 so i added a 2nd bottle of Dr Tims and after 48 hours theres no change, my temp is at around 25 degrees Celsius should i be worried? how can i fix this?