Wow, what a great thread! I think the most telling comment regarding this experiment goes back to the first post:
<<< Again, as Mr. Borneman himself concedes, the salt brands are often inconsistent even between batches. So, even with all the power and forgiveness one can gain from a repeated measures study, it doesn't apply here because the batches of the sand brands weren't consistent and experimenters only made this inconsistency more pronounced by doing 100% water changes with each new batch of salt. >>>
I think it's common knowledge that most if not all salt brands are not 100% consistent from batch to batch and formulas may also be purposely altered at any time by the manufacturer. This would make any short term experiment kinda worthless IMO since you're not comparing 100% consistent products to begin with. At best, it may give someone a very small idea of what salt(s) may be somewhat more conducive to success with keeping certain specimens as opposed to other salts, but even that's a big stretch IMO.