thats a good start. the tips will burn from over fertilization.not always the case with organics though.generally if your temp is 70 on the top canopy,chances are that the temps at the bottom of the plant is only really65-64 at soil top.my garden runs no more than 79 during the day and no lower than 70 at night.(if you have a photoperiod) try to keep those night temps no more than a 10-12 degree swing.it will help with yield and over all node spacing.My sativa bottom leaves curl downward when my temps drop.I have a o.g kush clone that was given to me .It was severely over watered and all the leaves were curled.I didnt water it for 8-10 days and kept it in the back of the room with less light. once the soil dried up,bam fine. .the best thing to do is not water it for a few days,if it happends to be a lock out or over watering problem.If you are using ffof the soil is packed with nutrients.my clones usually dont get any fert for at 2 weeks from transplant(because of the soil content)