Hey moore! Yes, 2 gals is too much. I had a big strain in 5 gallon smart pots and the most in heavy flower(week 7,8,9) the most they took was a gallon every 2 days. I got just a dribble of runoff with that. I am in LED and a highly pourous medium with a bunch of perlite. Water them in a few days with a gallon and see where your runoff is, lift the pot when she has been watered and that is your wet weight of the pot. 2-3 days later, lift her again and this is the dry weight(not bone dry but push your finger down the side of the inside of the pot, if soil sticks to your finger, let her go another day) do this weight method and you will never over or underwater again!! Sooner than later, you will know when to water by the weight of the container!!