Always so many opinions. Here's another. Your phosphate is definitely too high, esp if you're keeping or planning on keeping SPS corals. How's your nitrate? If both are high, you could consider doing some carbon dosing, with vodka, vinegar, or a product like NO3PO4X; if you do start carbon dosing, be sure to have a protein skimmer going and use it aggressively. Then reduce the carbon dosing dramatically when nitrate gets close to zero. To just get phosphate down, GFO is your best bet. I use RowaPhos, but there are many good brands. Start with less than half the amount of GFO recommended, put it in its own bag, and put that bag in a filter sock or cup. Retest your phosphate level at least every other day to judge whether you need to add more or even take some out. In addition to these things, also increase your water change frequency (4X as often) until the nutrients come down. And make sure that your makeup and topoff water (RODI) is nutrient-free. This approach should bring your numbers in line fast enough that it doesn't take forever and slow enough that nothing in the tank suffers for it.
