Chuck Gadd wrote in message . ..
On 27 Nov 2003 10:52:40 -0800, (Nick D) wrote:

Does anyone have any ideas about how to reduce GH without affecting
the PH? I have too much Calcium and Magnesium in my tap water and
would like to reduce it without compromising the PH levels. My GH
right now is 10deg, which is roughly 180-200ppm. I think this is too
high and it is also affecting my plants as high concentrations of
Magnesium/ GH block the uptake of Potassium (the reason my plants are
yellowing in an otherwise healthy tank.)

I don't think 10 degrees GH is too high. Probably not high enough to
cause problems with potassium uptake.

Which plants are having problems? What are the other tank parameters?

For overall yellowing, I'd look at light levels, and nitrate levels.



Chuck Gadd
http://www.csd.net/~cgadd/aqua

Hi...thanks for replying.

Check out this Link from the 'Magnesium Master'.
http://fins.actwin.com/aquatic-plant.../msg00193.html

It would be useful if they was a website outlining all Macro & Micro
Nutrients, and which nutrients _block_ other nutrients. It is driving
me mad that my Amazons are disintegrating along the tips and edges and
yellowing overall, with holes in the leaves to boot. This has been
happening for months now! People just keep telling me its Potassium
deficiency. I think that Magnesium also blocks Iron, as well as
Potassium, so this could be the problem. Infact, last week (in a
frustrated rage) I dumped a whole 250ml bottle if Seachem Potassium
supplement into my tank and there has been no changes whatsoever! New
shoots are yellow and weak, while older leaves are fading away.

Tank Specs:
2 Platys
5 Cardinals
1 Cory
1 Pleco
1 Dwarf Frog
2 Hatchets
29 Gal.- Setup 8 mo. ago
Light: 1x20watt Hagen Sun Glo & 1x20watt Aqua Glo (On 14hrs/day)
Temp 76F
Ph 7.0
Gh 10deg
Kh 11deg
Nitrite 0
Ammonia 0
Iron .75 mg/l
Trace Elements Added Weekly
Flourite Gravel Bed
4 Amazon Swords (2 Already Yellowing after buying 1 week ago, others
disintegrating around tips and edges)
2 Melon Swords (Yellow & Browning)
1 Anubias Barteri (Yellow Holes & Brown Marks)
Cabomba (Growing Out of Control)
Osirius (Could be Doing Better)
Wisteria (Holes in Leaves)
Hygros (Twisted and Yellow Leaves)
Plants are growing new shoots but very pale and not very fast.

Thoughts anyone??

Thanks,
Nick D.