Agreed with LBF, those two plants aren't aquatic, but if you put the ribbon plant sitting in the fikter it should suck up ammonia. Also, you want a lot more coverage, you want the line of sight broken up way more so the girls can escape each other, as fights do break out. I had a small one break out, I had a small one the other day.
Have you cycled the tank? You need to, the girls will already be stressed, adding ammonia into the mix isn't smart. If you haven't take the shrimp out and do so with ammonia.
15 Gallon NPT
1g no tech bowl in the making