That's really strange about the Coral Snow... if it was a really fast decline with them then I would suspect brown jelly disease (it's a protozoan) in which a LPS can melt off literally overnight or a matter of hours.
And it may have been coincidence with the Coral Snow.
But at any rate, you don't have to do Coral Snow anyhow. It's just something that grabs ahold of the yellowing compounds and makes it easier to skim out so your water is theoretically a little more polished once the initial cloudiness clears up.
And it's totally different than the pellets anyhow. Think of the pellets as an alternative to a phosphate remover that instead 1) does both nitrates and phosphates, and 2) does not need to be replaced every month.
Hope this helps.