New azureus darts

I picked up 3 new darts last night(they are about 3 months old i was told) and have them set up in a sterilite bin with moist paper towels and a pothos plant. Which also gives me time to properly set up their tank as well. I have a 10 gallon set up which would of been a grow out tank but i think im gonna go ahead and set up a 20 long or a 29 gallon tank for them instead. What are some good live plants i could put in the tank? How long should i keep them in the sterilite quarantine setup? Im new to darts so im still gathering the little details haha(ive been doing research too) i just want to make sure i have everything set up right!