Re: Will amazon swords survive under the bulb that came with the tank?
Not sure you really need Flourish Nitrogen with your current lighting. I would look for a product just called Flourish (aka Flourish complete). This contains a little bit of all key macros and micros, including iron and potassium. This defiency is proably what is is turning leave brown/yellow. They should be getting enough Nitrogen from the fish waste, and the comple will have some excess nitrogen as well.
For the anubias and plants like ferns, most people use fishing line to tie them to a rock or driftwood, then put that near the base of your substrate. That way the root is not under the substrate. Having it buried, will eventually lead to root rot in most cases.
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