Trust me I had problems similar to your but not to your extent. I found that the water out of my RO
with a DI
cartrige still had high levels of P04. So I decided to start using some phosphate removign media.
1st I mix my water in a 5gallon bucket. I add the RO
water and my salt and I put a bunch of free po4
removing medial (I think it was phosban). I stirr it all up and then let it sit for a day or two with a airstone and heater.
Then I also add the po4
stuff to my HOB
filter. Between the two I am able to get my po4
levels very low. Between that nad a turbo snail my tank got 100% better in abotu a 2 week time frame.
Other htings to look at are how long you keep you lights on and many people also say you have to make sure your bulbs are not old. When the bulbs get old the color they create and put into the system changes. As it does it tends to benifit the algaes more than corals.
Jsut ideas for you. Good luck.