John: If those pictures are of your grow I wouldn't change a thing, but is the 90 degrees the ambient temperature of your grow space? I hope it's not the temperature of the reservoir because I've been told that's way too hot. We're being taught to keep the nutes at 65 degrees. We're also being told to keep our ambient air temp between 65 degrees at night and 75 during the day. I hope that helps. HSA