Good plants to add to cycle a tank are
Hornwort it's a floating plant that sucks out fish wastes faster than fish can excrete them. Carbon Dioxide, Ammonia, Nitrites,Nitrates and Phosphates all go into the fast-growing foliage. It was listed in Tropical fish hobbyist magazine as a good plant to filter your water and cycle a tank also
Anacharis that you can get at Petco for about $2.99 a bunch.
I cycled my 20 gal. with 10 White Cloud Tetras as they are really hardy. I was able to get 10 for $1.00 at my local fish store as they are used for feeders but I think they are really nice schooling fish to have.I have not lost any of them during the cycle. I added a bio filter pad from my 55 gal. tank and used this stuff called cycle to speed things up. I did 1/4 water change after 1 week and tested my water with a API dropper test kit.
If you have a friend or know someone with a aquarium ask if you can use one of their filter pads because the good bacteria is in the pad.You can use gravel or sand from someones tank and put that in a pantyhose and float that in the filter or put it in the corner of your tank as that has good bacteria in it also to speed things along. I also heard that
Zebra Danio Tetras are good to cycle a tank also. Most Tetras need a fully cycled tank as they are sensitive like shrimps to a new tanks.