big plants

Mystery auto flower!! 64 inch tall 43 days a old!!

Hi I am growing in a MH 2.3 x 2.3 grow tent with 2 different strains Granddaddy purple and Pineapple Express. If you look at the pic they are touching each other and touching the side wall of the tent. Is it ok for plants to be touching like this? Will it hinder yields? Besides buying a bigger...