I use API liquid fert...i it says you can use it once a week...which i did for awhile but went to maybe once a month cuz the plants got massive...the pics i uploaded are about a month or so old.....some plants need CO2 others just need good water and a decent light i just have a T8 and it's doing wonders....you can search for plants on Google for low light to medium light ...the plants in that tank i got all at Petsmart....just make suue you clean them very very well....either using a salt in a small dish not enough to kill them, or small dose of bleach i forget how much....i had gotten Damsel fly larva from petsmart plants in my tank.
API leaf zone is what i use for the ferts
But like stated you can use ammonia i've never tried this route...just make sure its pure ammonia, not the clear ammonia....should only be ammonium hydroxide for the ingredient i believe. If you shake up the bottle a bit and it foams and stays foamy no good....if it foams/bubbles and dissipates quickly and is called pure ammonia and has only ammonium hydroxide it should be the right stuff.