anyone with a magic cure or answer?

[niloc16]

ok so some of you may know i have been battling a wicked case of brown cyano and i took some readings today for the 100th time here they are

po4 .05 (always been this the entire time the tank is running)
ca 400
dkh 8
nitrate undetectable
mg 1140 ( i know this is really low but cant get it up, i have an entire jar of zeomag in the reactor too)

i have recently cleaned all 3 tunzes and they are blowing like crazy. almost a week ago i guess i put 3 new mh bulbs in. i cleaned the skimmer recirc pump and it is hauling as usual. i have replaced all 3 filters in the ro unit twice in the past 2 months. i have not changed the ro membrane

i have lost about $250 in ricordia, $150 in blastos, frogspawns are retracted qutie a bit, a few sps tips are stripped out. i have lost a branching cyphastrea that i got off marc and it was rockin in the tank. i have lost 1 sps colony and i think 2 little frags. the snails are flipping over everyday i guess because the cyano is poisoinous to them. cant count how many have died

i dont know what else. i syphon it off every week and by the next week its back on the rocks. when i syphon the sand the next day its back with a vengeance. i was thinking lately that the bulbs were prematurely expired and causing it, but i dont know how long after the new ones are in would the cyano disappear

so i guess i'm asking what else is there to do? thanks in advance