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are you using a chelator in your solution? It's ESSENTIAL .. in your 
aquarium, unchelated iron doesn't stay very long in its less oxidized 
(Fe (II) state) ... I've got a batch i made @ work about 3 Mos. ago, 
and it's still fine .. i used 20g of EDTA (WAY overkill, using much 
less next batch), and i'm having no problems with iron staying in 
Shawn Keslar, Chemist
Nat'l Res. Ctr. for Coal and Energy
Analytical Laboratory
PO Box 6064
Morgantown WV 26506-6064
304 293 2867 x 5472
FAX 304 293 3749
skeslar at wvu_edu