Some people dose more iron, but way back when CSM+B was first being sold as an aquatic plant fertilizer Greg Watson tried doubling the amount of iron in it, and found that it made no difference to the plants.
Hoppy is one of the people you can trust absolutely ... so I am a little uncomfortable disagreeing with him <grin> ...
So I want to expand on what he wrote above <g> ... way back when dinosaurs like me roamed the earth <g> ... ok, not quite that long ago ... I was dosing a LOT more Iron that most people ... in fact, I routinely was doubling the amount of Iron ...
What Hoppy is referring to ... is that I tried an experimental combination of Plantex CSM with Extra Iron ... the problem was that the extra Iron came in the form of an EDTP chelated iron.
You can scan the forum here for all of the arguments on both sides of which kind of chelator works best blah blah blah <grin> ...
So what Hoppy is referring to is my experiemental version of CSM Plus Extra Iron which was not the success that I was "hoppying" for <grin> ... ok, bad pun <grin> ...
I still believe that most people will find better success with higher Iron dosing levels.
From a purely commercial perspective (i.e. forget any nitpicking arguments about PH, GH, etc.) ... if Seachem finds it commercially viable to sell "Flourish Iron" then I would argue that we can accept that there are very legitimate circumstances where it is beneficial to dose extra Iron ...
If you are willing to pay commercial prices ... Seachem Flourish Iron is absolutely a fantastic product ...
However, if you want a more do-it-yourself approach ... then we have to explore what DIY alternatives are available. Chelated Iron comes in a variety of formulations - with particular differences in what chelator is used ... and different chelators perform differently based on water conditions ...
In general - when Hoppy says my CSM plus Extra Iron was not a rip roaring success ... the explanation of why is not that the extra iron wasn't beneficial, but whether it was readily available to the plants in differing water quality environments ... and it was that inconsistent performance in different water quality environments that I did not advocate for my extra Iron version ...
I knew it worked for me ... I love extra Iron ...
Whenever I want that "extra sparkle" in a tank ... for example, right before a show or exhibition, I will always juice up the Iron ...
If you are not getting the results you want with Iron - check the chelator you are using, if EDTP, try a DHTP Iron chelate... or vice-versa ...
I personally like Spring 330 - a very common 10% DHTP Iron Chelate ... for me it works well. But I have almost always lived in environments where I have really hard water (generically speaking).
Generically speaking ... those of us with hard water are going to generically speaking have more difficulties with Iron and Iron chelates ...
Add CO2, and all kinds of acid impacts from driftwood and all of the wildly varying other things that we do to our aquariums <grin> ... and it rapidly becomes difficult at best to make generic assumptions about what works best in what kind of environment <grin> ...
In biblical terms ... as for me and my house, until I move to a different location where my water conditions change, we will always follow the path towards more Iron <grin> ...
Hopefully my post is both humorous and mildly informational ...
Different things work differently for different people ... my plants and I like Iron - yum yum and I believe in feeding my plants a well balanced diet with all of the basic food groups including funky minerals (humans often think of as vitamins) like Iron ...
Now its' time for this old geezer to take his Centrum Silver Ultra Men's vitamins ... which includes Calcium Carbonate, magnesium, zinc, and a lot of other minerals - ironically without the Iron .... hmmmmm ... something seems wrong here <grin>!!!
But you know ... they do sound a lot like the same micro-nutrients we feed our plants!!!
Greg Watson