My fish tank is full with green hairy algae for about 1 month.

I don't know why and I don't know what to do.

I went to the dealer close to my house but they are not very nice and I don't think that they are well informed about reefs..

My water is good: ammonia = 0,
nitrite=0,
nitrate=0,
KH/alkalinity=8,0/2.86,
magnesium1455ppm.
calcium 410ppm,
Iodine
0.06-0.10ppmm strontium=0( I have to add some )
Please help as soon as you can. I only buy what you advice in your book, but this is major and looks very ugly. The corals and fishes look happy.

How old is the tank?
Are you using tap water purification? (using unpurified tap water will cause algae)
What type of lights are you using? (are you using reef lighting? if not you should and the bulbs should be replaced every 6 months)
Are you over feeding? (feeding too much will add to algae growth)

There are allot of explanations of algae in my book and on the website. And they all evolve around the above questions.

Let me know the answers, and or revisit the book. All the answers are in there. Read my column (on the web or cd "To the beginner")

Best Regards
Robert