I was able to convince a former employee to actually move all his inverts into one bank of tanks and treat the others with copper. He actually listened and said he had a huge decrease in mortality. I think this is the kind of commonsense measure Humblefish was talking about that they could do on the cheap. Sure, copper doesn't fix everything, but does work at least to some degree against the common parasites we encounter.
From what I hear though, the bigwigs there don't want their folks doing this. I can't for the life of me figure out why that would be, unless they are worries someone will overdose and wipe the whole bank out at once.