Brown on plants

[CassCats]

Its an emersed grown Amazon sword, those leaves will turn brown and new leaves will grow long and narrow. So very normal for these leaves to go brown. Not a sign of deficiency

A root tab will be appreciated by swords for sure.

 

[Essjay]

Besides the issues other members have discussed, as you are doing a fishless cycle, you are adding ammonia. A lot of plants have problems with this, though I don't know if ammonia affects Amazon swords.