Thanks Glenn. Not once in 5 years have I gotten my phosphate below .10ppm, it is usually between .10-.15ppm, and it has gotten into the .20ppm range from time to time. I've been growing sps for the past 2 yrs at this range. I've come across articles from time to time highlighting sps tanks with phosphate in this range w/o having issues.... encouraging. Good Read :read:
NOTE: there are some corals that will be more sensitive then others, this should be kept in mind. And many animals, including corals, can adapt to levels that are outside their optimal ranges, this may be happening in this case for the corals highlighted in these tanks (and mine).