Milky white snotty very slimy algae

Question
I have had a reef tank for 7 years, 110 gal.  Torn it down and set up this new one early February, 2007, 75 gal. This past week I've had an outbreak of a milky white snotty very slimy substance. It started in the refugium skimmer part and has worked itself up to my tank. Sunday morning I cleaned my skimmer out completely. Monday morning this stuff was full blown.
At this point I have added Poly Filters (2) and turn the lights off in the tank, left the lights on in the refugium.
I don't know if it's an algae, overfeeding, or what caused it.
All my parameters are normal.
Nitrates 0
Nitrites 0
Ammonia 0
Phosphate 10
Salinity 1.022 (usually keep it at 1.025)
 but with adding top off water its gone down
Calcium 320 (trying to bring it higher)
Magnesium 1140
Hardness 7
Ph 8.5

I run a Euro Reef Skimmer, Mag 5, Tunze Powerhead (in tank), powerhead in refugium, chaetomorpha, live rock,
a lot a janitors (snails, crabs, cleaner shrimp, 8 fish,
sand sifting cucumber, serpent starfish;
Livestock seems to be doing okay.

I've tried to find a lab that can tell me what it is, but with no luck.  Do you know of any that can do this?

I am considering tearing it down cleaning rocks and everything, but don't know how
contagious it is whereby this cleaning won't make any difference and it will be back unless treated with something.
I thought of using Red Slime for Cyanobacteria; although this stuff is white, stringy, snotty, very slimy.
Anything you can tell me, will be greatly appreciated.
Thank you.


Answer
First off make sure it is algae, can you take some to LFS? I have never had this problem and have a problem identifying it. Maybe some pictures will help, if you can take photos and e-mail them to me maybe I can be of more assistance. ship_planner2000@yahoo.com sorry I would really hate for you to tear down your tank after 7 years.