Falkorne

just got an eleaf pico 21700 and i have no clue if i have to use the ello tank or if i can use any tank so long as its a 510 thread, id love an answer to this as soon as possible im looking to buy a wax tank....for reasons and i dont want to drop 50+ dollars on somthing that wont work/have to return it. thanks for your time :D