what went wrong

[TimT]

Yes, it will neutralize any phosphate that the rock releases.

[reef-keeper]

You could add some of your old LR back in you the tank if you use Foz Down as well. You could also use seachem stability as well There are a load of products you can use. I use Dr. Tim's one and only nitrifying bacteria. Worked great. Follow directions on which ever product you use.

[whistlerskipro]

So after 48hrs of blanketing my tank, phosphates down from 2.5 to .25.
Ammonia, nitrates nitrites remain unchanged at 0
PH 8.1

I was lucky enough to be given another 20lbs of live rock bringing total to 65lbs, and another 4"LS.
Finally I added Sachem PhosGuard and Purgin and a sock of charcoal in a canister filter.
The tank remains very cloudy. Is this right?
Thanks everyone

Newbie

[reefwars]

You should get a good phosphate test kit I'm assuming because of the numbers you listed it's an api test kit? Putting a blanket on a tank to kill off algae won't decrease phosphates but if anything increase phosphates , think about it if algae dies where does that po4 go? Back to the water colum so right away I'd be looking at my test kit going well thats a bit odd lol get a fresh phosphate test kit when you have the chance next it will make life alot easier in the long run

Also have a read here about phosphates as well check out other articles they have

http://reefkeeping.com/issues/2006-09/rhf/