Fishkeepers, I need your help.
I have a 15 gallon Fluval aquarium. It's been running for about a year. I've wanted to plant it, but not knowing how, I waited. About three weeks ago I bought the plants and put them into the aquarium.
Within a week, the two tall ones (don't know their name) began flagging. They grew weak, and slowly turned brown. Within a few more days, they were completely brown and had wound up flat on the gravel, waving a bit with the current. I took them out. I'm very sad.
The other plants seem hardier, but most leaves have small brown sections on them.
Why have I become a plant killer? I'll appreciate any advice you can give.
= new reply since forum marked as read
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