Take a gamble! how much grams do you think is realistic?

That is a tough one to answer friend. If you know what your doing then you could get a good amount do it wrong and it could be very low. I am experienced in hydro grows although I went to soiless and that's were I have stayed. Not sure an autos potential but they need vigorous roots and plant growth to reach their full potential. Maximum dissolved oxygen in water is achieved at 62 to 68 degrees. Lots of air pumping to the roots and easy on the auto nutes. They dont need as much as photos. Get the free lux meter online for your phone and keep them at the right height and you should get quite the harvest from her. Just dont stress her much. You need them growing time without stress to get these to a good size. Cheers friend