A word to the wise - additives requiring a skimmer

[toytech]

It could have been the sudden drop in phosphate that knocked the corals out , ive been using fozdown too in my frag tank (without a skimmer) and i used too much and paid the price . My few sps frags bleached or rtn`ed all together overnight .When i use a small amount at a time though all my corals are fine.