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Old 09-28-2012, 08:15 PM   #131
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I've always had high mg too. It reads just above 1500. I have coral growing, but not the best of growths. I wonder if high mg is a common thread.

(btw, I don't want to tell you i told you so - just trying to help! but i do get the same voltage readings in sump as i do in dt and the only thing i have in the dt is 1 koralia pump)
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Old 09-28-2012, 08:16 PM   #132
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Originally Posted by scottayy View Post
(btw, I don't want to tell you i told you so - just trying to help! but i do get the same voltage readings in sump as i do in dt and the only thing i have in the dt is 1 koralia pump)
LOL I know, and I do sincerely appreciate it!
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Old 09-29-2012, 10:01 AM   #133
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Scottay, Ca has not been dropping much at all, just alk. There has been a ton of coralline growth over the last few months, so maybe that is soaking up the excess carbonate, but it has definitely not been a linear relationship between Ca and Alk levels.
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Ah. It may be magnesium and strontium that's low. Coralline algae growth taxes strontium and magnesium hard. From what I've read coralline algae is made up of strontium but also requires magnesium, bicarbonates and calcium and when it has a burst of growth it can drop those levels.
When calcification occurs, as in hard corals growing the skeletons or coralline algae growing, there is a defined amount of elements used in this process. For every 1 meq/l (2.7 dKH) of alkalinity used, the process also uses aprox 18ppm calcium, 1ppm magnesium and 1ppm strontium.
This is a great article on the subject...
When Do Calcium and Alkalinity Demand Not Exactly Balance? by Randy Holmes-Farley - Reefkeeping.com
"Another reason that calcium and alkalinity demand is not exactly balanced in many aquaria has to do with water changes. Many aquarists (including myself) do not attempt to match the calcium and alkalinity levels in water change water to the aquarium water. Consequently, each water change will alter these levels in the aquarium, and will alter the observed balance between calcium and alkalinity demand. What direction the change takes, however, will depend on the salt mix chosen and the aquarium water parameters. Commercial salt mixes vary from high calcium and normal alkalinity to high alkalinity and low calcium.
For example, if the aquarium is maintained at 420 ppm calcium and 4 meq/L of alkalinity, and the water change has 500 ppm calcium and 2.5 meq/L of alkalinity, each 20% water change will increase calcium by 16 ppm, and will drop alkalinity by 0.3 meq/L. Using the same water change scenario used in the nitrate calculations above (10 changes of 20% each over the course of a year), these water changes will increase calcium by 160 ppm and drop alkalinity by 3 meq/L."
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Old 10-01-2012, 09:43 PM   #134
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Larry great info and link.


I guess I am confused then - I have seen my alk drop pretty consistently weekly and when I do a water change it brings it back up. My Ca hardly moves though.

Do you think I am making a mistake starting 2 part, or will this help eliminate alkalinity as a cause of my coral woes.

For what it is worth, the increased water changes over the past 3-4 weeks and the changes I made to lighting (increased intensity, lowered duration) seems to have had a good effect. I haven't noticed much decline in the last couple weeks and my 3 week old hammer is still opening up which is a record for me (I previously killed 3 hammers, and they all went pretty quickly in contrast to my other coral which has been a slow decline).
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Old 10-03-2012, 06:18 PM   #135
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Ok 2 part auto dosing system installed. I am pretty sure nothing else is gonna fit in this stand...

I am starting at dosing the BRS 2 part recipe at 0.3mL/gallon and I will adjust from there.
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Old 10-05-2012, 06:24 PM   #136
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Looks great fort. Good job getting it all in there. If I need help packing for a vacation I'm calling you in for support. Lol.
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Old 10-05-2012, 06:32 PM   #137
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I swear that after 2 days of dosing, my coral already looks better. My zoas are opening bigger, my SPS look healthier, and the hammer is more open than I have ever seen it. My frogspawn is growing a new head as well. I don't want to jinx it, but I really hope I have turned the corner here.
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Old 10-05-2012, 06:54 PM   #138
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That's great to hear fort . Hope it will continue to progress for ya.
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Old 10-05-2012, 08:57 PM   #139
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We're all breathing a big sigh of relief for you man. It's crazy how one hiccup in water parameters can make everything go downhill but you ID'd and overcame the problem. Definitely a first rate job in my book!
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Old 10-05-2012, 10:03 PM   #140
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Crossing fingers lol.
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