Can't stop the losses

[Samw]

You don't use Instant Ocean do you? I believe I had a bad batch of Instant Ocean recently (about 2-3 months ago). My powerhead turned white when mixing it. The newly mixed water stayed cloudy after mixing for a day. My mixing tank had a film of white residue that won't dissolve. I used the water anyways for my water changes. Not surprisingly, I lost a few corals and many declined after that. I stopped using that batch and I bought a new bag of Instant Ocean which mixed fine and my corals have recovered.