04-15-2012, 12:28 PM
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There are some issues mentioned, but before I get to those, may I ask why water is evaporating? Normally this should never be a problem, unless the tank is uncovered and the water and air are very warm. The weekly partial water change should be sufficient to deal with minimal evaporation, and at the water change the water can be properly prepared.
But turning to the issues...you should not be adding iron on top of Flourish. There is more than sufficient iron in Flourish to supply any planted aquarium that is natural or low-tech. Excess iron can cause problems, and it is toxic.
And being a heavy metal, Prime does detoxify it. Though this is relevant to the level of iron. Prime is intended to handle toxins like heavy metals at levels likely to be found in tap water. It is not effective when these toxins are above "average" and most municipal water supplies will have what we term trace amounts of such heavy metals, since they are concerned over public health and humans can normally handle trace amounts. Fish though cannot, always. Iron and copper are two that even at levels safe for humans can kill fish (and plants for that matter).
So back to the issue, I would not add iron on its own, unless you are running a high-tech method in which case you will need daily doses of macro-nutrients and more but not excessive levels of micro-nutrients, of which iron is just one.
Many years ago, iron was often considered the mineral most needed, especially for swords, but this is now known to be misleading [one reason why one no longer gets told that Laterite, which is simply iron clay, is "essential" under the substrate] and there are other nutrients more important--but as always, balance is the key. Flourish Comprehensive and FlorinMulti are both balanced with respect to the nutrients included, and these are more than sufficient dosed once or at most twice a week.
Last edited by Byron; 04-15-2012 at 12:30 PM..