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Old 10-22-2008, 03:04 PM   #11
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Ooh, another idea! I can mix up a gallon of RO with the new salt bucket to see if I get the same mag reading. will keep you posted...thx
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Old 10-22-2008, 03:06 PM   #12
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I don't know about you, but it usually takes considerably more than the 1 cup salt/2 gallons water to get me to my SG=1.025. Are you using RO/DI?
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Old 10-22-2008, 03:15 PM   #13
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I mix up enough for a few weeks at a time. I have a big garbage bin that I fill with RO (roughly 17 gallons) and I add salt by weight - it ends up being around 4 3/4 lbs. I think the amount suggested on the label is for 1.023 so I added a little when I was figuring out how much my full bin would take, but it was pretty close to what was suggested on the label. Sometimes I have to adjust it a little up or down.

As far as I remember there was a volume measurement on the label too - so hopefully I can mix a small quantity for the purposes of ruling out a bad batch the first time around...

If the magnesium is indeed too low I'm hoping it doesn't do any permanent damage. I only have two zoas and one torch at the moment but I don't seem to be able to go to the LFS without picking up another one. Good thing they're 1/2 hour away!!
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Old 10-22-2008, 06:33 PM   #14
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Maybe just a bad batch of salt.
Mystery solved, I think. I made up a gallon of RO/DI water and mixed it up to 1.025 SG from the NEW bucket of salt and the magnesium came in at 1310. So the original bucket must have been bad.

So I guess I need to start dosing heavily (no more than 100ppm per day) to get the tank from 1,000 to 1,300 and then start using the new salt bucket. I wonder if I call Seachem if they'll replace the defective one.
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Old 10-22-2008, 07:42 PM   #15
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Glad to hear you got it figured out. Too bad though that your tank ended up so low. I don't have any experience with low magnesium, but I would think that for the short length of time it's been low, you shouldn't have any problem.

In the process of raising it, I'd personally go the slow route and only raise it 10-15 ppm per day. And I'm pretty sure Seachem, or your LFS, will refund you for that bucket of salt. Either that, or they'll give you the "hmm... y'know you're supposed to remix all that salt up in the bucket before use because it settles into layers during shipment" speech. And no... I never do that.

Ever since Reef Crystals recently had that supposedly weird batch with low Ca, I've always done a complete series of tests of a sample of water made from the first scoops from a new bucket. It's just good piece of mind, and an easy way to catch something quick if I happen to get a "bad" bucket.
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Old 10-22-2008, 10:34 PM   #16
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I've always done a complete series of tests of a sample of water made from the first scoops from a new bucket. It's just good piece of mind, and an easy way to catch something quick if I happen to get a "bad" bucket.
Well I know that -- now. How come I need to learn everything the hard way?
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Old 10-22-2008, 11:31 PM   #17
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Because we all did too!

But honestly... that "testing the new bucket" thing is relatively new for me. Makes sense after you think about it, but you just assume the salt is made correctly, right? Go figure.
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Old 10-23-2008, 03:41 PM   #18
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So I called Seachem this morning and they gave me this whole story about how much they test all their products before they go out the door. The basic message was that it was impossible for my salt to be bad. They want me to send a 2 cup sample to their tech support team for analysis and then "they will be in touch." We'll see.
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Old 10-24-2008, 05:48 PM   #19
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Quote:
Originally Posted by Kurt_Nelson View Post
Ever since Reef Crystals recently had that supposedly weird batch with low Ca, I've always done a complete series of tests of a sample of water made from the first scoops from a new bucket. It's just good piece of mind, and an easy way to catch something quick if I happen to get a "bad" bucket.
Just out of curiosity, how much water do you mix at a time when you do PWCs?
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Old 10-25-2008, 12:33 AM   #20
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Just out of curiosity, how much water do you mix at a time when you do PWCs?
I only change out 4-5 gallons a week. (46g tank). I try to keep between 15-20 gallons of saltwater stored and usually mix up a couple buckets of 3.5 gallons each when the storage tub gets low.
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