Sure you can do that.....just watch the plant's roots (the sativa one) to make sure they don't start dying off and affecting the indica as well.
Weedhound Reviewed by Weedhound on . 5 week 2 days flowering death like problems. need help ok so my plants R 5 weeks and 2 days into flowering 1 of em is a sativa and is looking real bad. the other 1 is an indica and is looking much much better than my sativa. my lights R 3 inches away from the buds. and the lights R cfls and they R 23 watts each and there is 8 of them. the indca looks great. I am thinking that they might be also root bound. Rating: 5