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Old 02-07-2005, 10:59 AM   #71 (permalink)
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I would like to summarize my experience of treating calcium deficiency symptoms in my tank so far.

For almost two years, I simply could not grow Rotala macrandra, or its relative r. magenta. I get stunted, twisted/deformed new growth. The plants keep trying to send out new growth, but the vicious cycle continues. In severe cases, the new growth turned white and disintegrated. It never occurred to me that it might be Calcium problem because my tap water GH=8. But when I observed some other plants like Ammania gracilis displayingthe same twisted/deformed leaves, I decided to give Ca supplement a try. Couple of months into Ca addition(first using CaCO3, now CaCl2 bringing GH to 13), my rotala macrandra is unbelievably beautiful and weedy, completely blood red. R. magenta is doing much better as well. Ammania is somewhat better but still has twisted leaves(not stunted), perhaps I should further increase Ca dosing.

I don't believe it is absolute Ca deficiency in my case. Although I don't have a good test kit to accurately determine Ca:Mg ratio, I believe I have plenty of both in the water. Perhaps not high enough Ca:Mg ratio? Or even maybe Ca:TDS? It is not Ca:K in my case because I have varied K dosage without seeing a difference. My TDS is about 300, so K variation does not change TDS much.

An incident over a week ago sort of confirmed my belief of relative deficiency. I dosed Oxytretracycline in my tank to treat some fish. And the plants response was not what I expected. I see red plants like Rotala macrandra 'red' and 'green'(yes, even 'green' can be red too), r. wallichii, r. magenta, ammania gracilis, a. senegalensis, a. bonsai, etc. sending out HOT PINK/MAGENTA new growth, while green plants like stargrass, Eichornia diversifolia, pearlweed, rotala nanjenshan, rotala sp. 'green' sent out new growth totally WHITE. After a quick google search on Oxytretracycline, I realized it will react with Fe and other metals(Ca, trace, etc) in water so I am probably seeing a severe case of Fe/trace deficiency right now. However, the hot pink new growth on Ammania is totally smooth without Ca deficiency symptoms, probably due to the abundance of Ca after CaCl2 supplement. So Ca deficiency in my tank is indeed relative to other elements.

Another conclusion I draw from the above incident is, if I see hot pink/magenta color in red plants in other people's tanks, I know it is not due to Iron(more likely the lack of it), I get blood red, rusty red/orange new growth when Iron is abundant.

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Old 02-07-2005, 11:57 AM   #72 (permalink)
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Quote:
Originally Posted by shalu
Couple of months into Ca addition(first using CaCO3, now CaCl2 bringing GH to 13), my rotala macrandra is unbelievably beautiful and weedy, completely blood red. R. magenta is doing much better as well.
Hi Shalu

Can you tell if there was a difference in plant health after switching from CaCO3 to CaCl2?

Thank you,
Edward
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Old 02-07-2005, 12:46 PM   #73 (permalink)
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One thing I noticed with CaCO3 was, even after the dust settled down, I can hardly measure any GH increase(I was using 2 tablespoons in 100gallon after each 60% water change). Perhaps it is not really dissolving much in my water, but my ph is 6.6(CO2)? I don't know enough chemistry to analyse this. I did see some plant improvement with CaCO3, but CaCl2 did more, probably just because more Ca got dissolved..

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Old 02-08-2005, 12:47 AM   #74 (permalink)
 
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Just wanted to report what I consider a K:Ca issue.

GH=7.

Last week I dosed too much kno3 because I believed that was the rate that my tank was consuming. Anyway by the end of the week the ludwigia sp. Pantanal looked absolutely crinkled and horrible!!! Other plants suffered but this one - it looked REAL bad. I measured 50 ppm no3 and ~40 ppm K using lamotte kits.

I did my 50% WC and didn't add kno3 for a few days and the pantanal looks much much better.

So I don't know if it's excess of N or K but here's a testimony of someone who paid for the K kit...

Aviel.
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Old 02-24-2005, 07:35 PM   #75 (permalink)
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Just found this thread looking for a reason for P. stellata stunting. I can't believe that it's a straight-up Ca deficiency issue as I my water conditions are exceedingly hard (KH 14, GH 18 - ARLC tank). I have several stems growing like mad right next to some that are stunting. I have hit-and-miss luck with my P. stellata. Under 3.5 wpg CF lighting it grows very well at times but seems to stunt at other times for no reason. I've found that (and this is likely my fault for clumsly planting) when I put top cuttings of P. stellata in the substrate with healthy root growth, they do well. When the top cuttings have poor roots on planting, they seem to stunt much more easily. I suspect I'm experiencing an issue with root feeding but don't want to jump to any conclusions as I am a rookie with this plant.
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