GMSgrowsanswered grow question 4 years ago As long as you go light on the feed and not heavy your ok as long as you dont run into root issues because of warm water. I would definitely use a chiller running the water at 62 degrees if I was going to run multiple. Watch your girls,and start at 400 ppm 0.8ec see which grow better, the slower ones may have like 500 ppm better., but go by the ones that are growing the fastest. The underfed ones will still do good, over feed and your others wont. Cheers friend