You need to step back and take a breath, was reading through your responses and other people's recommendations. First, why are your Nitrates at 80, even after a 50% water change and you have No fish currently. Are you using RODI for water changes or Tap Water? Did your tank actually Cycle? This all sounds like a recipe for disaster that will basically lead to dead animals and you being frustrated. Salt water tanks move slow, it's just a fact. There are some tricks you can do, such as using Bio Spira, but this basically just speeds up the colonization of bacteria that feed off the Ammonia, turning it into Nitrites and then Nitrates. It will.not get rid of your Nitrate problem.