HA is getting me down

[Koresample]

My tank is undergoing a surprisingly persistent growth of HA right now, and has been for about 2 months. I will tell you all the things i have, and have done, in the order i have done them in and include all my chemistry, any help is welcome!

40 gallon tank 24 x 24 x24
1 X Koralia 2
1 X Koralia 3
1 X koralia nano
AC 110 converted to a fuge
Tunze 9002
Odyssey 250w HQI + 2 X 65w PC fixture (brand new)
4 stage RO/DI water, TDS measures 0

2 False Percula Clowns
1 Mandarin dragonet
1 coral banded shrimp
clean up crew misc snails, crabs
Various softies and a few LPS

50 lbs LR + 60 lbs of LS
Ph 8.3, dKH 9.3, MG 1340, CA 440, Nitrate,nitrate 0, Ammonia 0, Phosphate 0
DD Salt


i have followed all the things in Mindy's guide to kill this stuff off;

Hacked at it with scissors, and did a 25% water change every two days four times

added a TLF Phosban reactor and have cycled 250 ml of rowaphos through once per month

Increased the Mg to 1600 for several weeks (lots of good corraline growth)

Upped the water changes to 50% once per week, for the last three weeks

removed about 5-6 lbs of rock to increase flow around and through the LR

There is so much flow that even the mandarin has to hang onto the rock for dear life and the Clowns have hosted in my Colt!

Arrrrrgh!

Does anyone have any other suggestions or ideas??