so your saying i should moderate it and not let it cover my whole entire tank? as long as i do that is it good?Good for jumping fish, or fish that are more 'secure' with not having such an open top. Spreads faster than rabbits reproduce, you'll never be rid of it. Will cut out a lot of light to plants below it, if you let it!
It can be a good plant, used correctly. Alternatively, it can be an absolute menace.
so your saying i should moderate it and not let it cover my whole entire tank? as long as i do that is it good?
well i like it thats yYou will be pulling it out constantly. However, it is a good nutrient sponge, and depending on your tank MAY be good.
Do you have plants below it, that you know to need a good amount of light? Also - why are you considering adding it in the first place? I wouldn't add it just for the sake of adding it - because when it comes time to get rid of it, you're out of luck.