Hey buddy,
It looks as if you have made a great start in the addiction, pardon me, hobby of planted tanks. From what I can tell you have the immersed version of an Echinodorus amazonicus "Amazon Sword". In time if you take care of it the leaf style that is on it will rot away and be replaced with long slender leaves that flow in the water current. This plant gets BIG if left unchecked, but there is no reason to not have it in your tank as long as you keep it in check and do a few other things:your substrate needs some
fertilization, and the roots can be buried in the gravel. I think when you said that they weren't supposed to be buried in the gravel you were thinking of something like a java fern. Also, in the future it would be beneficial to your tank to get an upgrade in lighting like a retro-fit set up from
ahsupply.com if you start to really like growing plants.
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As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.
Albert Einstein (1879 - 1955),
"Geometry and Experience", January 27, 1921
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