Hi I got my first marine tank on Tuesday have tropical before hand I got the flex 123 I put live coral sea sand in there coral sea dry rock I've been using secham stability to start it off i did some test a 2 days ago using api test ph of 8.2 ammonia was 0.5 nitrate came out at 0.5 and nitrate was 5.0ppm tested it today it was ammonia of 0 and nitrate 0 and nitrate was 10ppm has the cycle stalled or are the tests not the best and should try others ones thanks