Always dissolve any powder buffers etc that you are putting in your tank with corals, in my own experience API buffer max. it seems to highly agitate corals and they shrivel up. using either tank water, RO
or distilled water in a cup. if it's dissolved it wont be so much of a bother.
funny thing is the instructions on the container, don't say anything about this, as this was my first time using the product, you kinda don't expect results that end up hurting your tank more than solving.
anyways, thought i might add that nice little statement as i would have liked to know before facing grim results.