This is my first time growing and I had a few questions...
(Mountain Jam/Chimera x10 Grapefruit/Female x10 Hydro..)
For the most part MJ seems to be a bit more Indica and GrapeFruit more Sativa.
What would be the ideal Temp and Humidity? Assuming that the humidity and temp should be diff for both is it wiser to grow in different rooms? Also would it be more effective to have Different systems because one is Indica and the other is Sativa? At the moment I am gonna make a home made DWC system, any suggestions for those that have had personal experience with these strains?

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