I'm looking to buy some tall plants where I won't have to buy a co2 machine....I currently have amazon swords and Anubias plants looking to add more plants but id like some tall plants as well
Some taller plants that should grow well are vallis, some crypt species are taller or something like cabomba should grow fairly tall, although you'll need to watch it doesn't get too "leggy" in a low tech setup.
I add fertilizer to keep my plants strong and healthy my lights are 15 w all of my plants have grown especially my amazon sword and they all look green an healthy I'm just looking to give my tank alittle more decoration on the top because I have a 55 gallon tank
Cabomba might not be best there then since the lighting is fairly low (I'm presuming you have 2x15w bulbs over your 55g?) and it will end up growing quite stringy.
The others should be fine though.