I understand your scepticism with Dr Mac but think about this for a second ... who has more to lose by bleached corals for the sake of a couple bucks ? ... does the manufacturer have some secret deal with Dr Mac to replace bleached corals as long as Dr Mac keeps endorsing the product ? ... if you think about it you know that is not true ( not that it is not possible and would make a good " made for TV script of big business corruption " and all but just not very likely
)
Here is how I see it so far ... there seems to be an aclimation that the corals go through in changing salts and the smaller the change increases your chance for success. Also by following the procedures that those that have used it sucessfully have done would be prudent.
EDIT ... for those that dont know already Dr Mac sells CORALS
Cheers