08-26-2010, 11:01 PM
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Hello, and welcome to Tropical Fish Keeping forum.
On the local plants, be careful; I don't know where you live, but if it is in a temperate region where you have winters with freezing temps, the plants in local ponds will need a winter rest and die back. Tropical plants in aquaria do not generally do this (some Aponogeton will), though they do go through "rest" periods when growth is minimal but they do not die back.
On the water parameters, do you know your hardness of the tap water? Your water board can tell you this, they may have a website. This is important because the carbonate hardness (KH) will determine the extent of pH buffering. With a pH of 7.2, and little or no KH, the tank will naturally acidify and the pH will drop into the 6 range. But with more KH it may be buffered to remain at 7.2, and regular weekly partial water changes will also work to maintain a stable pH.
Libebearers as mentioned prefer baqsic harder water, and it is fairly easy to achieve that. We will be able to go into this more when we know the hardness of the tap water.