Have them give you numbers and note what test kit or kits they use. Let us know.@Scott Jeffries I'm going to go to the lfs to have them test the water because I don't know if I'm just doing it wrong. I didn't know high phosphates can kill, maybe that's the issue, my total volume is around 125 gallons, so I guess around 20-25 gallons should be good so it doesn't shock the corals too much?
10 to 20 % is just fine... more if your alk is over 12. Like stated above every other day if you need to
You might even take your test kits with you and have them show you how to test to make sure you are doing it correctly.