Join Date: Jan 2004
Location: Bucharest, Romania
Need help with my EI dosing routine
I have a problem related to macro dosing. But first let me tell you something about my tank:
- tank is about 6 month old, it has the following dimensions (cm): 100x40x40
- lights: 4 x 39 w (T5 fluorescent bulbs - Osram 865) about 10h/day;
- CO2 about 2-3 bouble/second;
- pH around 6.8.
- temperature ~25 Celsius degrees.
- fertilization with microelements is assured by JBL fert. system (substrate, daily and weekly liquid ferts);
- list of the plants: micrantemum micranthemoides, anubias nana, limnophila aromatica, HC, blyxa japonica, pogostemon helferi, glossostiga elatinoides, micranthemum umbrosum.
Now, let's get to the problem:
for fertilization with macroelements I'm using an NPK in an estimated Index regime.
The solution has the following characteristics: for each mll I add in my water I increase the concentration of macroelements with: 1ppm NO3, 0.1 ppm PO4 and 1.33 ppm K.
For a few months now, I'm adding weekly 40 mll solution, in my calculations this addition stabilizes concentrations, over time, at these levels:
- 52 ppm NO3 (at a presumed uptake of 28 ppm / week)
- 78-79 ppm K (at an assumed uptake of 28 ppm / week)
- 5,2-5,3 ppm PO4 (at a presumed uptake of 2.8 ppm / week).
- are this calculations OK? If not, what is the mistake? what would be the correct weekly addition in order to maintain about 30 ppm of K and NO3 whilst PO4 is maintained around 4-5 PPM?
- if my math is not wrong, and the values are correct, altough my fishes and my plants are OK, isn't wise to dim the concentration to about 30 ppm of K and NO3 whilst PO4 is maintained to this value (I have some GSA problems too)?