Anacharis does poor in water with higher nitrates IMO.
I had nice looking anacharis back when I first started using live plants. I neglected the water changes on an over stocked tank, and the nitrate got higher. As the got higher, the anacharis started looking bad.
Did the water changes, it came back fine. That was with no ferts, no Co2, and 40 watts over my 55.
A no brainer plant IME is hygrophila sperma and hornwort. These grow for my in anything. I cant seem to kill java moss either.
On the other hand..I cant keep java fern or anubius nana if I tried. Both look real bad on their older leaves(bad to me, fine to my friends)
Plants use ammonium/ ammonia, then nitrates. If your filter system is new, they help by using ammonia. If they don't have ammonia, they use nitrates. It is all a balance issue. If you don't have high lighting, don't use liquid ferts(or very minimal on doeses)
Co2 is a plus in my opinion(and some sort is required at high light levels IMO), but I have two tanks that I do not fertilize or use Co2, and the plants do Ok. Not good enough to put their cuttings in my 55 gallon planted though.
Artificial looks like it says. They are actually easy to clean with diluted bleach. They just look fake..as they are. The silk one are nice for a while, until they start getting stringy and torn..then look worse than any.