man you can top the shit out that sativa..its stretchy enough already,, might sound crazy to you but i would take about 3-inches off or more considering the strain and how fast it grows cause man you gonna be in sativa hell when those startin flowerin!!!
i see u hung the light,,but man u shouldve kept those sativas topped earlier during vegg,,cause you aint got that much space and you growin sum indicas in there too and thats what youd had to do to keep em all the same height,,,them sativas would be bushy as fuck!