Someone should get some fresh salt water in a bucket, test for phosphates, add some phytoplex, and then test again. I'd be interested in seeing what happens.
To those who wonder about dosage, let me relay some good advice I once heard. The companies will always want you dosing more so that you run out faster and then buy more. Therefore, the amount advised on the bottle is likely the maximum amount they could realistically suggest, so it would be advisable only for tanks with the most filter feeders that could be stuffed into the tank. So, I (having only a few filter feeders) usually dose about 1/8 of what it recommends (usually about 1/4 as much and 1/2 as often).
92-gallon corner tank, 100lbs of LR
, 140lbs of sand, 250watt 10,000K MH
, 110watts of actinic PCs, Mag 7 return, custom refugium, AquaC EV180 w/ Mag 5
Female lyretail anthias, eyelash blenny, tomato clown, saddleback clown, firefish goby, 2 sand-sifting stars