quote:Originally posted by rshimek
I would note the point here that in my bioassay/toxicity study, I didn't test the composition of the salts; I couldn't afford to, and it was irrelevent. The composition was irrelevent - only the survival was relevent. There is no way of telling which components or mixture of components may or may not be lethal.
Like I said, I think the data are fine. They answer a question, "What is in the salt on the date those particular mixes were purchased?"
That is, however, the wrong question, the question that should be asked is, "Can any given salt support delicate animal life when mixed? My bioassays were run 24 hours after the salt was mixed and 2 of the 4 salts tested resulted in significant mortaility. Why they did is not our problem, it is the salt manufacturers' problem. Our problem is chose a salt that is good from the mixing, not after having to be "conditioned" in a tank.
quote:Originally posted by dgasmd
I read the original article back when Dr. Shimek's results were published and drew my own personal conclusions. All of which are besides the point anyway. Regardless, I did not change my use of IO, which to this date, right or not, continious. However, I, like many others, had/have a serious question with no answer to this date:
If the 2 salts pointed by the bioassay results of Dr. Shimek's study are better at survival, how come hundreds of people switching to those salts from IO and others reported from coral stress to complete tank crashes? Almost every single person I know that tried them had major problems. We are not talking about a complete system water change to the new salt, but rather just started use the salts pointed by Dr. Shimek's study in their customary and regular water changes. And that ranged from a 2-<10% water change with no other variable changes. The moment they went back to their old salt use, whichever that was, it made the problems stop or stabilize. I completely agree with Dr. Shimek when he says The composition was irrelevent - only the survival was relevent. , but give me some theories as to the reasons for the problems with the practical use of the salts in a reef aquarium.
Some people jumped in with silly arguments and reasons of "too quick of a change" without thinking of the practical chains of custody corals go through before making it to your tank. They go from the ocean, to the holding facility, to an exporter, to the bag in transport, to the wholesaler, to the LFS, and finally to your tank. Does anyone in their wildest dream think that all those middle points use the same salt as the end user? That is just ridiculous given most corals that make it to your personal tanks have gone through "dips" in several saltwater compositions in a matter of days.