I don't know what you have in that well water- but I do hope I can keep the Ludwigia looking so red.
My root tabs and liquid ferts both contain iron- but I think I'll try the steel wool in the filter trick to make sure I can keep the Ludwigia so red.
My water here is extremely soft with very little dissolved in it naturally. I always add baking soda and liquid calcium each change for my inverts (and may up it some more now I have the Briggs)- so I doubt I have much natural iron since little else is dissolved in the water.