Re: Aquatic Plants Digest V1 #242

> Well after 24 hours of CO2 from a bottle of yeast ph has dropped to a more
> reasonable 6.8 just before the lights went on for for the day.  However my
> yellow and brown spots are still growing bigger. 
> Should I increase the hardness to say 80 or 100 ppm?  Note 55 ppm relates
> to about 3.3 grams per gallon or a bit less.  And if so how much baking
> soda should I use for this?
> Dennis


I doubt that your brown spots on your amazon swords are due to CO2 deficiency.
I'd say it's more likely lighting or nutrient deficiency.  I'm pretty sure
this is a symptom of potassium or magnesium or nitrogen deficiency.  Do you
use any fertilizer & what are your nitrate levels?