Originally Posted by BSS
I can second this. I've to 1+" of fish per gallon in my tank and my NO3 levels stay steady through-out the week. I only add NO3 at the water change based on a measurement of my levels (somewhat against the EI methodology
). So, in your tank, I would certainly avoid the "mid-week" PO4 additions.
Also, CO2 levels >=30 ppm seems to be important for the EI approach, so you might want to bump your CO2 levels a bit.
Then again, your plant load seems a bit low. I guess it depends on how you count plants, but looking at individual stems and the like, I probably have 100-200 plants in my 46g. So, you might need to up your plant load, IMO.
EI does not "need" the mid week dosing, it's just a suggestion, if you are getting enough NO3 from other sources like fish load, there's no rule that says you must dose 2-3x a week, that's a guess for high light tanks at max levels without fish.
What EI does assume, is that the excess NO3 from that dosing 2-3x a week does not harm things or cause algae. So the fish NO3/NH4 waste add more, but never less
That's the biggest difference with EI with any other method........it does not assume excess is bad.
You merely guess what the plants will potentially use...........over what time frame? Most do weekly routines...........but it's not a "rule" either. I've done 2-3-4-5-6 weeks out. But weekly changes does help overall. Most folks with issues can do it and then back off if they chose.
Slowly back off one fert at a time till you get a negative response, then bump it up a tad from there.
Just an idea to reset the tank and assumes excess does not cause problems, .....which.......... is quite easy to verify.................
CO2, and the levels added are based on the plants(or/and algae) far more than the ppm levels.
I got into this hobby to grow plants, not test, most did, so that's what the EI is good for, often times, those test are not correct. Sometimes they are.
For many years folks claimed excess= algae, PO4= algae, NO3=algae , need RO, etc......
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