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Re: [APD] KH with no CO2

Hello Vaughn,

I grow aquarium plants in an aquarium as well as outside in ponds in a very
tropical climate.   I have some ponds and aquaria gased with CO2 but many
are not.   The water plants get a boost when I keep the KH up around 60 to
80 ppm using potassium bicarbonate which is a little more expensive than
sodium bicarbonate but I think extra potassium is a better thing than extra
sodium in plant water.

The bicarb soda is about $1 a kilo and the Potassium bicarb is about $8 a
kilo but I think worth the extra.


On 15/12/05 6:22 AM, "Vaughn Hopkins" <hoppycalif at yahoo_com> wrote:

> I set up a 29 gallon tank a couple of weeks ago, with water sprite,
> Hygrophilia Difformis, microswords, java moss, java fern, some
> ludwigia, etc., but no CO2, because I still haven't received the bottle
> I ordered on ebay.  I have 51 watts of T8 fluorescent tubes, Fluval 104
> filter using a spray bar at one end and an extended inlet at the other
> end.  The plants are mostly growing now, very slowly, but growing.  I
> have been fertilizing using Gregg's chemicals, somewhat less than if I
> had CO2.  And, I changed 50% of the water after a week.  Today I got a
> KH test kit.  The water is less than 1 degree KH hardness, but 13
> degrees GH.  So, I checked the tap water for KH and it is 3 degrees.
> Now, my question is:  are the plants growing by utilizing carbonates
> for their carbon, thus depleting it?  And, when I add CO2 will that
> depletion continue, or will the plants just use the CO2?  I am trying
> to slowly bring the tank water to at least 4 degrees KH hardness before
> I get the CO2 going.
> Next question:  Assuming the plants will deplete carbonates, what kind
> of schedule of baking soda addition would be appropriate?  I tried
> looking this up, but am just too lazy to stick to it.
> Oh, and I just moved in 6 cory cats and 6 silver tip tetras - they will
> have open  house next week and everyone is invited!
> Vaughn H.
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