DaveJ's Pearls of Wisdom Part 2 - The why fors of Dosing

Following up on the Test Kit nugget of wisdom... with this installment I will tackle Dosing. There will not be any photos in this one... just some examples, procedures and other general advice on proper dosing.

Dosing what?? When I refer to dosing in this post, I mean the big 3, Alkalinity, Calcium and Magnesium.

Let's start with a brief description of the holy trinity (Calcium, Alkalinity and Magnesium).

Alkalinity is, in basic terms a number that represents the amount of acid in a system that is needed to lower the pH of a system to convert bicarbonate and carbonate to carbonic acid. UH??????

Its a number.... what it is chemically is not important unless you are a chemistry geek, what is important is to understand what numbers you want in the tank and what alkalinity allows corals to do, which is to grow. Equally important is to understand its relationship to pH and the other members of the Trinity. If you want an overly scientific and amazingly in depth, and frankly overdone read, try this.

http://www.advancedaquarist.com/issues/feb2002/chemistry.htm

What does Alkalinity do? It allows corals and in some measure, all critters that utilize calcium to grow. It makes calcium usable for skeleton and hard structures, like shells and coral bases.

What effect does alkalinity have on our tanks? It helps keep pH in balance, or keep it at a certain level (range) easier and more efficiently. Alkalinity alone does not drive a pH number, but will have an impact on it. Conversely, its possible to effect pH and not impact Alkalinity. This means you can have a high pH and low alkalinity (though its hard) and you can have a low pH and high Alkalinity. These are difficult to do, but do happen and you should be aware of them, but for a basic understanding, the higher your Alkalinity, the higher your pH will be (or at least should be).

When you are dosing, you want to test Alkalinity using a test kit at all times, you do not want to rely on your pH value to determine your Alkalinity. While it will give you an indication of what your Alkalinity is, it will not always be accurate.

Alkalinity in Natural Sea Water (NSW) typically runs around 7 - 7.5 dkh. I will use dkh as the standard unit of measure, but it can also be measured in meq/l and ppmCaCO3 (though that one is rare). For a conversion chart of the different units of measure, please refer to this web page ( http://ozreef.org/library/tables/a...re you really are getting your money's worth.
 
Nice one Dave. Always great to get grounded (or brought back to ground) on stuff like this.

Sticky +1

Thanks!
Gerald
 
The alkalinity of a system directly affects the stability of the Ph. It does not lower it or make it rise. Though some of the buffers that are added to make the alkalinity higher can also raise the Ph. The higher the alkalinity is in the system the more of an acid or other factors that make Ph drop would be needed to make it drop.
I have seen winning systems with a high alkalinity 12dkh and low Ph barely at 8, do very well. 1"Reef tanks typically range from pH 7.8 to pH 8.6." The high alkalinity stabilized the Ph, though lower than normal it stayed very stable. Staying at the higher end of the scale with your alkalinity will overall be better for any reef system. I try to maintain alkalinity at over 10dkh, around 12dkh. 2"In short, total alkalinity is a measure of how much acid it takes to lower the pH of the water sample to the bicarbonate endpoint. That is, how much acid it takes to lower the pH to the point where one has added enough acid to potentially convert all of the bicarbonate (HCO3-) to carbonic acid (H2CO3)."

And with a higher alkalinity you do not have to keep the calcium over 400. In all the years I have kept a reef, I have never targeted for a calcium level that high, it would way too much work. Though if you want to work at supplementing that hard, you are welcome to it, though unnecessary. If it is kept around 350 you are doing great. The reasoning is with a higher alkalinity you can expect higher coral growth, which will lead to more use of the calcium in the system. In a large reef system maintaining a higher calcium level of over 450 would lead to constantly adding calcium. 3"In summary, and for the benefit of distracted speed-readers, maintain Calcium at levels between 350 and 450 ppm Ca, and alkalinity between 8-12 dKH without ever resting both concurrently at the highest end of their range. Calcium hydroxide (“kalkwasser”) dosed properly in concert with a deep sand bed (10cm + sugar fine aragonite) or a calcium reactor will yield the most benefits when supplementing Calcium and Alkalinity. Leading you to the next open door for advanced reef chemistry, I also recommend keeping magnesium levels at approximately 3 times the Calcium level (~1200 ppm Mg). For those not inclined to complicate their hobby with advanced studies of the dynamics of seawater, rest assured that regular partial water changes will serve your system well to dilute and refresh water quality."

Quote 1 and 2 from Randy Holmes Farley Reef Keeping Magazine article. http://reefkeeping.com/issues/2002-04/rhf/feature/index.php
Quote 3 Anthony Calfo, Understanding Calcium and Alkalinity in a WetWebMedia article. http://www.wetwebmedia.com/calcalkmar.htm
 
This is really good information. I'm just getting started on my tank and this cleared up a lot of questions I have had about calcium and more.
 
2Part

I'm not understanding the Quantity Price Chart. What is Base then the numbers that follow like 3-5 and so on?

And I'm sure buying bulk is great no matter what because of the savings, but (I guess this is up to me) with such a small tank as mine, 20 gallons, I could get by with the mixed 2 Part from lets say Kent or ESV? I can see where having an enormous tank like 300 gallons, you'd need to buy bulk.
 
@guitareefs wrote:
[url=http://www.bulkreefsupply.com/Two-Part-Kits/c52/p268/Two-Part-Starter-Kit/product_info.html]2Part[/url] I'm not understanding the Quantity Price Chart. What is Base then the numbers that follow like 3-5 and so on? said:
Quantity pricing, the number of buckets are the little numbers. 3-5 buckets.
 
@DaveJ wrote:
[I]@guitareefs wrote:[/I][quote="[url=http://www.bulkreefsupply.com/Two-Part-Kits/c52/p268/Two-Part-Starter-Kit/product_info.html]2Part[/url] I'm not understanding the Quantity Price Chart. What is Base then the numbers that follow like 3-5 and so on? said:
Quantity pricing."]

Right, but lets say I want the 3-5. What am I getting?
 
@guitareefs wrote:
[I]@DaveJ wrote:[/I][quote="[I]@guitareefs wrote:[/I][quote="[url=http://www.bulkreefsupply.com/Two-Part-Kits/c52/p268/Two-Part-Starter-Kit/product_info.html]2Part[/url] I'm not understanding the Quantity Price Chart. What is Base then the numbers that follow like 3-5 and so on? said:
Quantity pricing."]

Right, but lets say I want the 3-5. What am I getting?"]

You are buying between 3 and 5 of the Two Part Starter Kit's, at $44.99 each. If you are doing a group buy and 30 people wanted a starter kit,each kit would then cost $39.99 each.

Cheers,
 
This would make a great sticky. I don't think I could explain it that well and not put someone to sleep. :lol:
I started with the Advanced Reef Keeping articles but have adopted this plan over the last couple months and it works better for me so it's what I suggest as starting values.
Thanks, Dave
 
I've been adding magnesium (Mag Chloride) to my make-up water every two weeks when I do a water change. I figured that way I can add it all in without throwing the salinity off.

Should I be dosing Magnesium more frequently than that?
 
@BigJay wrote:
I've been adding magnesium (Mag Chloride) to my make-up water every two weeks when I do a water change. I figured that way I can add it all in without throwing the salinity off. Should I be dosing Magnesium more frequently than that? said:
I'm using the Brightwell powder and it works great. I am dosing daily right now of 70 mg of mixed solution for a 140 gallon system to get it back over 1300 and then I'll drop to about 20 mg/day added to top off water.
Ingredients
Magnesium sulfate (anhydrous), Magnesium chloride (anhydrous)

My tank is one of the weird ones at 14 dKh and 8.0 ph but it seems to work good but I would like the Alk to come down.
 
DaveJ great thread write ups I have learned couple bits of info I never knew before. Thanks for sharing this information with the club..


Now get back to work on your tank build before I send Guido over :D
 
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