When is Magnesium and Calcium necessary to dose? - The Planted Tank Forum
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post #1 of 73 (permalink) Old 04-03-2009, 10:22 PM Thread Starter
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When is Magnesium and Calcium necessary to dose?

After looking at the fertilator (APC) I realized I have never dosed either of these by them self. I understand the TPN+ I use in my nano has it (Magnesium) but in my 37g where I dose KNO3, KH2PO4, K2SO4, Flourish Iron and Flourish there probly isnt too much in there. As far as the Calcium I dont think ANY thing I dose has it.

The main reson I have been doing more research on dosing is that I cant seem to get my needle leaf stellatus to color up yet, granted it isnt even half way up my 24" tall tank and this could be the problem but I just though I would be seeing some by now.

Thanks.


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post #2 of 73 (permalink) Old 04-03-2009, 11:13 PM
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Why not add GH booster and see?

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post #3 of 73 (permalink) Old 04-03-2009, 11:43 PM Thread Starter
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Im sure like you we dont put things in our tanks unless we are a) expirementing ot b) sure it will improve the situation. This time im not interested in an experiment.

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Why not add GH booster and see?

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post #4 of 73 (permalink) Old 04-04-2009, 12:14 AM
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Im sure like you we dont put things in our tanks unless we are a) expirementing ot b) sure it will improve the situation. This time im not interested in an experiment.
Plants require magnesium and calcium why would adding GH Booster be an "experiment"? If you have little to no GH seems like it would be a good idea to add it. If Tom recommends it that would be good enough for me.


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post #5 of 73 (permalink) Old 04-04-2009, 12:18 AM Thread Starter
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Well I dont follow blindly, I like making my own decisions based on the need. With that being said, I have no problem growing plants. My GH is ~5 and my KH is ~12. So im not sure if it is necessary.

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Plants require magnesium and calcium why would adding GH Booster be an "experiment"? If you have little to no GH seems like it would be a good idea to add it. If Tom recommends it that would be good enough for me.


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post #6 of 73 (permalink) Old 04-04-2009, 01:29 AM
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Well I dont follow blindly, I like making my own decisions based on the need. With that being said, I have no problem growing plants. My GH is ~5 and my KH is ~12. So im not sure if it is necessary.
Are your levels in degrees? 5 degrees general hardness and 12 degrees carbonate hardness? If that is so, that seems like a very large amount of carbonate hardness. Perhaps that is why your needle leaf stellatus is not growing to your satisfaction? At any rate adding GH booster with the GH level you have doesn't seem like it would have a detrimental effect on you plants. Personally I'd be looking at your KH as a suspect in your situation.


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post #7 of 73 (permalink) Old 04-04-2009, 01:40 AM Thread Starter
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I seriously could have switched the two, I do that all of the time. Just for accuracy sake I will test them later tonight to see what they are.

They usually are higher though, and I thought that Ca and Mg were sufficiently present when these readings were higher??? This is why I never thought about dosing them. Hope that makes sense.

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Are your levels in degrees? 5 degrees general hardness and 12 degrees carbonate hardness? If that is so, that seems like a very large amount of carbonate hardness. Perhaps that is why your needle leaf stellatus is not growing to your satisfaction? At any rate adding GH booster with the GH level you have doesn't seem like it would have a detrimental effect on you plants. Personally I'd be looking at your KH as a suspect in your situation.


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post #8 of 73 (permalink) Old 04-04-2009, 02:00 AM
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Calcium and magnesium are the general hardness component. I really think if it's only at 5 degrees it could only help to dose some. I never have until recently and I think it's helped with oddly shaped, new growth leaves that I've had in the past.


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post #9 of 73 (permalink) Old 04-04-2009, 02:15 AM
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Dosing calcium regularly will likely not be needed. Calcium doesn't seem to be utilized as readily by plants. If you have a high CEC substrate like SMS, Florite, or Turface, you'll lose some KH to that, but it sounds like you're pretty steady.

Your tank has plenty of KH, regardless of whether it is 5 deg or 12 deg. If GH is 12 deg, you're fine, but if it's 5 you may want to give GH booster a try.

My GH was consistently 4-5 deg. For 6 months I could not get L. aromatica to grow quite how I wanted. I increased lighting, changed iron levels, changed NO3 levels, changed substrate.....I did everything I could think of. (To note, I did all of these separately over a long period so that I could rule each one out). When I started adding GH booster, upping GH to 8, is when I really started to see the growth I wanted. Growth had always been good before, but the color really started to come out after increasing GH.


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post #10 of 73 (permalink) Old 04-04-2009, 02:22 AM
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The thing with GH is that you don't know how much of it is magnesium and how much is calcium. Because of that, tossing a little GH booster in will ensure that you have enough of each. I found this true with my tank and my Gh was 12. adding 2 tsp to 125 gallons didn't even raise it to 13, but the plants showed response to it.

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post #11 of 73 (permalink) Old 04-05-2009, 12:54 AM Thread Starter
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Well I feel kinda foolish (maybe my test kit is bad). Just got done testing and here are the results.

KH-1 (maybe less)
GH-6

Like I said I think the test kit (AP) is a year to six months old, dont know if they go bad. The tank also has AS I and is injected with with co2.

Comments, suggestions...


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post #12 of 73 (permalink) Old 04-05-2009, 06:33 AM
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If I remember correctly, the word from API is that GH/KH test is good for 2 years.


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post #13 of 73 (permalink) Old 04-05-2009, 01:52 PM
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Do you use RO water for water changes?


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post #14 of 73 (permalink) Old 04-05-2009, 04:57 PM
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You probably already know that Seachem's Equilibrium is a GH Booster too.
http://www.seachem.com/Products/prod...uilibrium.html

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post #15 of 73 (permalink) Old 04-05-2009, 06:37 PM
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What about Kents R/O right. I use pure RO water and need to up both my GH and KH abit.

Will backing soda up the KH?

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