I haven't done aquariums in about 20 years
and looked up the Fluval type. The one big thing about planting aquariums is the plant source - some places are shady with plants and if you have any nurseries that specialize in ponds, that might be a good place to check for established plants.
In general, just like non-aquatic/terrestrial plants, moving them into a different environment (with different lighting/water conditions) will cause some stress. If you haven't already, certainly check the water pH, as well as ammonia and nitrate levels as that will have some impact. I.e., if you have too many fish in there, then that could cause an imbalance (what fish do you have?).
You could also try posting the Pet Group (although I know it's mostly cat and dog discussion there 
) - https://www.democraticunderground.com/?com=forum&id=1161