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Old 12-09-2009, 09:00 AM   #11
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Not sure what you mean by low calcium with Instant Ocean, unless you got a really old batch. It (Instant Ocean) has been reformulated and the calcium levels are right around 400 and alk around 11 dKH. I used to use only Red Sea Coral Pro, but the calcium was a little too high for me (470) and the alk a little low (7). I now mix them 50/50 and get around 430 calcium and 9 alk.
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Old 12-09-2009, 12:32 PM   #12
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Not sure what you mean by low calcium with Instant Ocean, unless you got a really old batch. It (Instant Ocean) has been reformulated and the calcium levels are right around 400 and alk around 11 dKH. ...
Do you mean Reef Crystals, and not Instant Ocean?

I agree that the new forumulation for both RC and IO have bumped up the cal/alk levels from the past, but those numbers for IO still seem a little high. They seem closer to the numbers I get on my reformulated Reef Crystals (at 1.025) after its been mixed for 48 hours or so.
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Old 12-09-2009, 02:26 PM   #13
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Do you mean Reef Crystals, and not Instant Ocean?
No, IO. New RC mixes to around 490 calcium and 13 dKH alk at 35 ppt.
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Old 12-09-2009, 04:16 PM   #14
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No, IO. New RC mixes to around 490 calcium and 13 dKH alk at 35 ppt.
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Hmm. While I've seen an increase in levels in the old versus new, they're nowhere near those levels. Go figure.
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Old 12-09-2009, 04:37 PM   #15
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I just mixed up a batch of IO reef crystals and though I used a little less because tank salinity was a little high, the dKH was around 8 or 9 on a batch that I used 9-1/2 cups for about 20 gallons (1/2 cup short). Didn't check the calcium, but there are not a lot of corals in the tank currently.
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Old 12-09-2009, 06:42 PM   #16
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Hmm. While I've seen an increase in levels in the old versus new, they're nowhere near those levels. Go figure.
I personally get 420 ca, 11 dKH alk and around 1300 mag with the 200g box of IO I have and I used Salifert test kits for all 3.
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Old 12-10-2009, 02:34 AM   #17
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I now mix them 50/50 and get around 430 calcium and 9 alk.
I like those numbers!
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Old 12-12-2009, 12:12 PM   #18
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I think it goes without saying that each bucket, bag or box of salt mix is not the same as every other bucket, bag or box of salt even of the same brand.

Caige,

What is your CA level? What CA demanding critters do you have in your system? If you are hitting 400ca and 3x that in Mag then you are doing just fine unless you have a heavy load of SPS corals that are depleting your calcium levels.
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Old 12-13-2009, 05:37 PM   #19
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I use Kent Sea Salt, bags only. I have found that the smaller bags (I get them in cases of three) have more consistent make up. FWIW, I have tried IO, Oceanic, Coral Pro, etc but I stick with Kent in bags only as it tested more consistently for SG, Ca, Alk etc. For anyone wondering, I did try the 200g bucket of Kent and did not get the same results. At any rate, I am in the "you can't go wrong with any of them" camp.
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