[Andrew]

pale yellow leaves- then mush.
Iron is the basic mineral to add, magnesium is the new kid on the bock. Not all plants will demand rch nutrients.
CO2 is plenty for most aquatic species- of course the more you recreate its wild habitat the more it will thrive.

 

[Andrew]

at present nothing- i am using raw R/O water- i am a believer of cycling the tank- starve and feed- seems to work for me.
However i use sera florena when i do fert- i use 1 cap full per 5 gallons, this contains iron and traces of magnesium. CO2 is the primary fert you should use.
I also use mineral salt- this helps open pours of the plant.