Planted Tank Guru
Join Date: Jun 2012
Location: Gainesville, FL
I agree they look like some sort of sword plant. However I suck at plant ID. Try posting an image in the plant section with a title ID please. Tinanti is a member that's very good at plant ID's. He seems to respond to most plant ID questions.
As far as them not doing well two things. You have them planted too deep. You never want to bury the crown (the base where the stem come out). Two, Flourish trace is basically only a trace fertilizer. You'll need to provide Nitrogen, Phosphorus and Potassium for them to thrive. It appears to me that the plants are lacking in those three nutrients. Consider getting some dry fertilizers it's much cheaper.