Calcium deposits on leaves - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 10-31-2016, 11:21 PM Thread Starter
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Calcium deposits on leaves

Oy

I have had a decent amount of calcium deposits on the leaves of several species of plants, mostly on older leaves of plants such as cryptocoryne, large valisneria and dwarf sag. I have the least on my limnophila. I have a 40 gallon with 4x 32 watt T8 bulbs, I don't have CO2, (they are wider then the tank though) and it is uncovered.

I haven't seen much calcium in my lower light 10 gallon tank.

The water around here is pretty hard. I was pretty lazy with water changes for a while, but I have a few hunches. Is the excessive evaporation causing the water to be too hard, or are the plants using CaCO2 for carbon, leaving calcium to deposit? maybe both?
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post #2 of 8 (permalink) Old 10-31-2016, 11:52 PM
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Are you sure it is calcium? Post some pictures


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post #3 of 8 (permalink) Old 11-02-2016, 01:32 AM Thread Starter
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Now I'm not totally sure what it is, but it has a crusty texture and it is light green in color, maybe whiteish

it could even be an algae I don't know.
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post #4 of 8 (permalink) Old 11-02-2016, 03:09 AM
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Biogenic Decalcification

though with the stuff on the glass, I'm not quite sure..
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post #5 of 8 (permalink) Old 11-02-2016, 06:35 AM Thread Starter
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According to what I'm seeing, dwarf saggitaria might be able to do this reaction too. After I searched "Biogenic Decalcification" I heard someone say "algae is more efficient than most plants at (biogenic decalcification)," so maybe that's why it is encrusted on the glass. Interesting.


This reaction can increase PH- I have a good amount of valisneria and I don't want the PH to get too high. My fish are looking healthy still, so that's good. It's been going on for a while.

I might have to consider either reducing lighting or adding CO2. I wanted to have this tank as low maintenance as possible. Has anyone ever experienced any real problems from this sort of thing happening?
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post #6 of 8 (permalink) Old 11-02-2016, 09:15 AM
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I had something like that in one of my tanks in the past. But it was only on glass corners and surface where glass meets the gravel. Never on plants. And It took a good 6+ months to develop. I always thought it was just calcium deposits as my water is very hard (20 GdH) and the green tint was just algae film growing on it. Never had it on any other of my tanks though... This one was med-high light without CO2 and daily Excel as carbon source with DHG as only plant.
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post #7 of 8 (permalink) Old 11-02-2016, 05:50 PM
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Im not surprised at all you are having such issues with 128W of lighting on a 40G and no CO2. Remove two bulbs or add CO2 perhaps? Do you have reflectors on?


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post #8 of 8 (permalink) Old 11-02-2016, 05:56 PM
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I always see that happening on the Vallisneria leaves in my concrete pond.
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