We talk about needing submerged vegetation in almost every post, so let's see what it looks like:
Elodea canadensis, sometimes called Anacharis (a former scientific name) is widely known as the generic pond submerged vegetation.
In Louisiana we use primarily anacharis for our submerged vegetation. It filters the water, it survives on fish waste and it serves as fish food. Anacharis is the reason we do not need to feed our fish and the reason the water stays clear with no artificial filtration.
Elodea (anacharis) is native to North America and is banned in some states because of it's invasiveness.
The American anacharis lives entirely underwater with the exception of small white flowers which bloom at the surface and and look like somebody threw popcorn all over your pond.
It likes to have some shade and will turn yellow and die when in complete sun.
Please use anacharis responsibly. When you have too much, just compost it, do not throw it in any nearby body of water.