04-13-2013, 12:33 PM
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As long as you have no fish in this experimental "plant tank" you are safe. Chesherca referenced this; many plants release substances, some of which can be very toxic to other forms of life such as fish, bacteria, even terrestrial animals--and of course other plants (aleopathy).
Terrestrial plants and aquatic plants must have very different leaf structures. This is why marsh or bog plants such as the various Echinodorus, cryptocoryne, etc develop different aquatic leaves from those they have when emersed. A terrestrial plant not evolved to photosynthesis submersed will not develop such leaves, which is why they tend to rot when permanently submersed. However, we all know that some terrestrial plants, thinking of those that are often sold in chain fish stores as "aquarium" plants, can sometimes adapt to some extent, at least for a time. I would not expect such plants to develop submersed leaves except through natural evolution in some cases.