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Re: Sodium in planted tanks
On Tue, 25 Apr 2000, Cavan wrote:
> Roger and Andrew: I switched over to Equilibrium from
> the RO Right to reconstitute my distilled water.
> Sodium only comes from what is in the Floursih itself.
> I don't think there can be much sodium in the tank.
> I wonder if there's anything funny about the distilled
In order for sodium to be the problem it would probably need to be there
at something over 10X the concentration of calcium. With 8 degrees of
hardness in your tank, I have a hard time imagining how that would happen.
> What's this about the balance between calcium and
> magnesium? What should the ratio be? Having heard
> all the postive things I've heard about Seachem
> products, I would think that the Equilibrium/Flourish
> mixture would give me the right proportions of
In most natural fresh waters calcium is more abundant than magnesium. The
ratio isn't at all fixed but it's fairly common for calcium content to be
3 or 4 times the magnesium content.
> I was thinking aboout possible substrate causes. My
> tank has an old undergravel filter plate covered with
> normal gravel and topped with flourite. I noticed
> some blackish areas in the gravel, and stirred them
> up. I have a bunch of burrowing snails, and the
> healthy roots bring in oxygen to break up the dark
> areas, though some roots do sometimes show black
> areas. A while back, I stirred up the gravel and a
> bunch of bubbles came up. I wonder if any of it
> diffused into the water. Could this be why some stems
> are fine when one RIGHT NEXT TO IT could be stunted?
I suppose this is possible but I have never seen it happen. In fact I
have several plants that flourish with their roots in the anaerobic zone
below a chunk of driftwood. At one time I uprooted a large B. longifolia
and found that most of its roots stretched out to one side, reaching out
about 6 inches and into the zone below the driftwood. My experience is
that the oxygen-depleted zones are actually good for plants.