There is a difference between Elodea and Anacharis but I cannot tell the difference. One of the more humorous things I have run across is that despite the name Elodea canadensis and the widespread nature of the stuff in NY and Canada it was illegal in Canada.
Bacteria are a living things. Bacteria lives on something, any solid thing which includes fish bodies, glass, plants, gravel etc. but not in water although it (the bacteria) needs water to live. Filter media is very good and as long as it is wet the bacteria survive if there is food available. There probably are more non identfied (graced with a name by some namer type person) than are actually named. If a bacterium occupies a place another bacterium will not occupy the same place. We have many bacteria in our tanks but only a few do a job for us and some of them take a while to grow. Bacteria only grow in accord with food and space available for them. I think that bacterias will grow on top of old colonies that have died off so cleaning a portion of the tank every once in a while is good.
Bacteria are a living things. Bacteria lives on something, any solid thing which includes fish bodies, glass, plants, gravel etc. but not in water although it (the bacteria) needs water to live. Filter media is very good and as long as it is wet the bacteria survive if there is food available. There probably are more non identfied (graced with a name by some namer type person) than are actually named. If a bacterium occupies a place another bacterium will not occupy the same place. We have many bacteria in our tanks but only a few do a job for us and some of them take a while to grow. Bacteria only grow in accord with food and space available for them. I think that bacterias will grow on top of old colonies that have died off so cleaning a portion of the tank every once in a while is good.