What is this?

I have this plant in my tank and I forgot what it is. Can anyone tell me what it is and how I can manage it. It seems like its growing 6 inches a week.

I clip it in half and throw out the bottom "old" looking parts.

any help would be greatly appreciated.


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Thank you

Hornwort? Cabomba? Can you describe the leaf structure?

Here is a better picture.

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Probably Hornwort.  If so it is kinda stiff or rigid.  Also has s distinctive pungent odor when you pull it out of the water and smell it.  good for sheltering small fry....guppies, etc.

Definitely Ceratophyllum demursum aka Hornwort.