i have a 12 G aquapod that im trying to cycle....there is absolutly nothing in it but unseeded filter media and salt water and a dead shrimp. I put the dead shrimp in on August 14th. on August 15th it was .50 on August 17th it was 1.0 and on august 18th it was 1.0then on septermber 13th it is 8.0, now it is September 30th and it is STILL 8.0....do i need to replace water or something..am i doing something wrong..?