I'm not sure where the high aluminum is coming from. The only thing I have in the tank for nitrates is bio pellets and brightwell aquatic phosphate E. I also dose agropower for coral growth. I don't believe any of them have aluminum in them.
I have marinepure ceramic biomedia spheres in our setup. Not sure if they contribute to high aluminum or sulfur? My tank is a mix of LPS and soft coral. The soft coral seem to do well but I keep losing the LPS.