A freshwater product review I thought id share from another forum:
"I've personally used the Amazon Iron and was very impressed with the results. I've used other types of Iron in the past and noticed that the Iron levels in the tank quickly disappeared. That because most brands use non-chelated iron which is less expensive but precipitates out of the water very quickly. You end up having to add Iron to your aquarium much more often with the non-chelated type and you can also run into toxicity problems with your fish and inverts. Within days of using the Tailored Aquatics Iron, all my red plants went from a pale, greenish red colour to a bright vivid red. Once they went red, they stayed red. I'm very happy with the quality of the product"- BCAquaria
http://www.bcaquaria.com/forum/showthread.php?t=16175
Cheers,
Brad