Where did you get your anacharis from? It's possible that when you got it it was already dying. Every time I walk into a pet store and look at their anacharis in the plant tank it's really gross. :[
Do you have enough ammonia in your tank for all of it? That might also be another reason why it's not doing too well.
Also you do have the correct kind of light right? Two wpg means nothing unless you're using simulated Daylight.
As for your lighting schedule you should have the light on for four or five hours, off for four hours, then on again for another four to five hours. =]
Do you have root tabs for your sword plants? If not you'll want to get some before it starts dying off.
That's all the advice I can give you. =]
Edit: Oh well that sucks. :[ Well if it helps any it sounds like what you had was a bit of rot combined with some algae. The algae was probably keeping the plant from getting al of the light it needed.
The easiest way to fix that is to take it out of the tank, then rub it a bit to get what you can off. With Anacharis though you have to be gentle.
It helps if you have ramshorn snails and shrimp. =] The ramshorns have a fancy buoyancy system and are really light and the shrimp can swim so they can both take care of the more delicate plants not to mention they'll eat the rotting stuff too. Mystery snails in particular love eating dead and dying plants. =]