How long does Fe DPTA last in the tank?
I have some iron that I got from GLA. I don't remember if it was EDTA or DPTA but their page today says 11% DPTA, so if they haven't changed it, then that's what it is. I've heard (don't remember from where) that this only lasts a few hours in the tank. If I dose this 12-15 hours before the lights come on (just after lights out), is it just useless?
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