Everything in my tank was perfect until 3 weeks ago, all my levels were zero, and then I had a huge ammonia spike. I counted my critters and nothing was dead, so I did a water change. This only made the problem worse. The LFS is hospitalizing all my corral, anemone, and clowns until the ammonia is back at zero, however the ammonia will not drop the test is off the charts, turning a dark blue color. Water changes don't seem to help. Can anyone PLEASE tell me what is going on?