lacustris;18377 said:
strange, i have tested the water with tetratest(drops) and the no3 was around 25mg/l, po4 with seratest was 1mg/l.
my water from the tap is no3 ; 15mg/l and po4; almost not measurable..
i don't add kno3 because of my testresults and i now add 3times a week about 0.5mg/l po4.if the tests are right it can't be a shortage of no3,po4 can it??
Well, right there you make the assumption that the NO3 test is correct and accurate and you based your dosing on these unknowns.
If you add 3x a week PO4, then
you know there's some regardless of a test kit's readings.
However, you do not with respect to NO3.
Also traces and GH and K+ need addressed as well.
You can add these, adding it will not hurt, KNO3 included, even if your test kits are correct.
This way you can rule it out.
IME, Star grass and Vals are fast growers and do better with less light and richer nutrients/good CO2 etc.
Regards,
Tom Barr