dosing seachem flourish iron
I am dosing Seachem Flourish Excel in a moderately planted tank. It is said that one should maintain Fe2+ levels at 0.10 mg/l. If I dose 10 ml of Seachem Iron in a 180 l tank after the lights turn off, iron levels are 0.5 mg/l. I know, this is way too high. However, the next morning, before the lights turn on, the iron level has dropped to 0.05 mg/l. Needless to say that at the end of the day (24 hrs after dosing Seachem Iron...and probably way before that), the iron levels are 0. I can imagine what would happen if I would dose seachem iron as adviced by its manufacturer. So how to maintain 0.10 mg/l? Is it normal that iron levels during complete darkness drop from 0.5 to 0.05 mg/l? Are plants using iron when there is no photosynthesis? Or is the iron just very instable? Or does is get reduced into Fe3+? Would it be best to dose seachem iron in the morning? Thanks in advance.