Hi all, Unfortunately it could mean absolutely anything. Whether it is right or not, I definitely /www.ukaps.org/forum/threads/from-reef-to-nature-aquarium-a-journey.60195/page-3#post-608056']wouldn't worry about it[/URL]">.
I'm not usually an advocate of test kits, but in the case of iron (Fe) it is quite easy to get an accurate reading for your tank water, mainly because nearly all iron compounds are both coloured and insoluble.
It is not a kit I've used, but if it goes red? It probably uses this method In which case one of the bottles will be an acetate buffer (sodium or ammonium acetate?) and the other hydroxylamine.
The problem comes because nearly all the iron in the aquarium isn't plant available, so even though there might potentially be a lot of it, in plant terms there isn't any, if that makes sense? Have a look at /www.ukaps.org/forum/threads/why-add-fertilisers-and-additional-plants-to-combat-algae.58866/#post-575638']Why add fertilisers.....[/URL]">
If your water is very soft? You probably will have some /www.ukaps.org/forum/threads/preload-dosing.58368/#post-570256']plant available iron[/URL]"> and your plants don't appear to show any iron deficiency symptoms.
cheers Darrel