1/2/5gal

Yo guys, my setup is: grow tent 2x2x4 light LED MarsHydro 300 (120w) + 6x28w led bulb seeds Sweet Seeds Dark Devil (AF) Question is: how many gal should I go? Due to low led power I think I can grow max 2 plants (i have 4 seeds) I can choose from 1/2/5gal pots