Also, how much is TOO much phosphates?Don't worry too much about your phosphates. They have to be really high to start doing any harm at all, and the main harm they do is they can possibly make new growth on stony corals kind of brittle. They're at a very reasonable number right now for a lot of corals.
Dosing nitrates won't increase phosphates. Remember, your light and filter aren't natural, so there's no reason everything you do in your tank has to be.
Make sure you're feeding your fish well- as much as they'll eat in a few minutes, daily. Feed any LPS and any other corals that want food. Broadcast-feed a tiny pinch of Reef Roids, maybe.