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biOrb LIFE 45 L, planted, EI dosing, CO2 injected; ADA Cube Garden 45F, planted, EI dosing, low tech
32 Posts
If you get the trace mix "pre-mixed" then I wouldn't mess with it unless you're convinced by observing your plants that you have a copper deficiency (seems unlikely). I'm not sure there's a right answer here. I use APFUK 'chelated trace' mix which is:

dry powder mixweekly in tank ppm
Fe 8.2% (EDTA Chelated)0.590
Mn 1.82% (EDTA Chelated)0.131
Zn 1.16% (EDTA Chelated)0.084
B 1.05%0.076
Cu 0.23% (EDTA Chelated)0.017
Mo 0.15%0.011

but there's nothing to say that's good/bad other than I'm happy with how that's worked out for me.
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