[Erirku]

Checked on my NO3 and PO4, but found NO3 at around 10ppm, and PO4 around 0.8ppm? Don't know why its not being taken up?
Co2: 20-30ppm
TE: 2mls 2X a week
Macros: mono potassium phosphate, potassium nitrate
lights: 55w CF
Thanks.

 

[pineapple]

Do a search on Potassium Sulphate (K2SO4) dosing. Additional K might be helpful. After many months of dosing just KNO3 + PO4 (Fleet) I found a similar situation. On dosing K2SO4 there was an immediate change for the better reflected by good quality plant growth.

Andrew Cribb

 

[Raul-7]

How big is your tank?

 

[Erirku]

It is a 15 Gallon tank.

 

[aviel]

RU sure about the CO2? How did you measure that?
How old is the lamp? Which percentage of the light reaches the water surface?
Which TE do you use?
How many fish? More than inch per gallon?

Aviel.

 

[Darkblade48]

RU sure about the CO2? How did you measure that?
How old is the lamp? Which percentage of the light reaches the water surface?
Which TE do you use?
How many fish? More than inch per gallon?

Aviel.

The CO2 can be measured from the pH and kH using Chuck's calculator.
Also, I find that the "an inch of fish per gallon" rule isn't really accurate unless you only work with slim bodied tetras.

 

[aviel]

If Erirku has peat in the substrate the PH/KH/CO2 table is useless. It took me 10 months to discover that my "totally inert" (according to the seller) substrate contains peat and that relying on the PH/KH/CO2 tables I was pumping way less CO2 than I thought I was.

This is why I asked "R U sure about the CO2" ???

Aviel.

 

[Edward]

The CO2 can be measured from the pH and kH using Chuck's calculator.

http://www.aquaticplantcentral.com/forum/viewtopic.php?t=2544

 

[Edward]

If Erirku has peat in the substrate the PH/KH/CO2 table is useless.

Yes, that's right.
Take your tank water in a cup, leave 24 hours sitting and then test pH. If the pH < 7 then you need to calculate your CO2 differently.

Or if you use any pH buffers then there is no way to find CO2 concentrations at all. There is no need to use buffers. KH can be increased by CaCO3 or baking soda NaHCO3.

Edward