Just make sure that you have stand to make the indica as tall as sativa's
for maximum light pentration during flowering...and so they don't stretch too bad...
I have many grows doing what you are doing...although, You wouldn't usually mix strains, only because they can be different heights, Imho

DWC is great...I would advise fabricating a pump system for used nute retrieval/disposal or drains so you can empty tubs each week without breaking your back...I love dwc, but you will soon find yourself trying to figure out how to NOT TOTE so much water, it get's old.lw