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Old 10-29-2012, 07:55 PM   #11
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Greg,
Do you test for any of the trace elements? (I2, Sr, B, K, etc)?
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Old 10-29-2012, 08:40 PM   #12
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No...I'm am breaking rule #7, never dose what you can't test for. The tests for these trace elements are best done by a full blown lab. I test, using Hanna, magnesium, calcium, alkalinity...the basics. I dose the Kent product with a medical dosing meter and am conservative as it can cause an algae bloom. Iodine is added at half strength weekly,,same with strontium. At those doses, I don't think it is possible to hurt anything and the chance it will help seems worth the risk. Again, I have no documentable evidence...but I think it helps SPS growth and may help prevent soft coral crashes.
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Old 10-29-2012, 08:44 PM   #13
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The problem is, at least from what I have read about Sr dosing, is some people have artificially high levels of Sr in a tank already, despite never adding it, and having an established tank crammed full of SPS. So if the tank already hovers at 10+ppm Sr, dosing it may not be a good thing - though it looks as if based on the article that Larry posted, the LC50 for most critters is substantially higher than you would ever see if you are doing a half dose, even if the tank was already at 10-15ppm.

I don't know much at all about iodine yet, but I have had a lot of experienced reefers tell me not to dose it. I need to reed more on it so I can understand it.
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Old 10-29-2012, 08:46 PM   #14
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Yeah, that's what I thought too. Been dosing this way for many years, so far so good. I would love to have access to a full printout from a mass spec. in a lab setting. Need to send a sample off and really see what is what.
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Old 10-29-2012, 08:49 PM   #15
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I agree - this would be interesting. Really it looks like that is the only way to get a truly accurate Sr+ measurement anyway - although I am not sure the resolution matters much, as there doesn't seem to be much difference between 5-15ppm Sr.

While I haven't read a lot about I2, it looks like testing for that is fraught with even more issues and problems.
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Old 10-29-2012, 09:12 PM   #16
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Yes...it is like predicting the weather, a lot of variables. And not all reef waters are the exact same. I recommend most people don't dose as the coral load isn't near to the point anything is getting used up other than calcium. But when you read the literature, it is suggested that these elements be dosed for certain corals. At least the stuff I have read. Will ask my biologist friends and see what they say.
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Old 10-29-2012, 09:12 PM   #17
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I came across that same article that Larry posted, and aside from all the "possibly's & maybe's" was the fact that one of of his suppositions was "the organism wants to get rid of potentially toxic strontium and depositing it into a CaCO3 skeleton is one way to accomplish that task." What I'm reading there is that, essentially, there's the possiblity that you are poisoning your coral to encourage faster growth. It wants to get rid of it, so it builds skeletal structure quicker in an attempt to facilitate that.
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Old 10-29-2012, 09:14 PM   #18
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Quote:
Originally Posted by Phranque View Post
I came across that same article that Larry posted, and aside from all the "possibly's & maybe's" was the fact that one of of his suppositions was "the organism wants to get rid of potentially toxic strontium and depositing it into a CaCO3 skeleton is one way to accomplish that task." What I'm reading there is that, essentially, there's the possiblity that you are poisoning your coral to encourage faster growth. It wants to get rid of it, so it builds skeletal structure quicker in an attempt to facilitate that.
Yes but again I would say there is no evidence for or against this from what I have read so far.
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Old 10-29-2012, 09:34 PM   #19
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Exactly. Like I said, a lot of possibly's & maybe's....... If R. H-F. doesn't even have a handle on it, then I'm inclined to leave it alone. I'm happy enough with my growth from his home made 2-part.
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Old 10-29-2012, 09:35 PM   #20
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LOL Good point. It is crazy that something so often recommended is really not understood at all in the hobby. I am not used to that. On the FW side (my comfort zone) there aren't too many things you can say that about.
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