I have never posted on here before, so bear with me. I have had an ongoing problem for some time now & it is absolutely killing me. I have tried everything & I still can't figure it out. I know I need to give as much info as I can in order for you to help, so, in no particular order, here goes: At different points in veg, my new growth gets yellowed out & starts curling sideways, cupping, looking dry & growth almost stops. I have had this problem with many different strains from different sources. I have changed soil mix from straight pro mix to 1 pt happy frog, 1 pt pro mix, 1 part large pearlite. I have changed nutrient lines like 4 times now starting with Nectar for the gods pro line, to Gen organics, to botannicare, to heavy 16. I changed my bulbs to new eye hortilux's. As this started happening after I started using R.O., I switched from R.O. to just sediment & carbon filter, then back to just straight city tap water. I've tried boosting CalMag, & Zinc to no avail. I feed - water - water. Usually 3-5 days in between. Temps are 70-75 night, 75-80, on rare occasion 85 during day cycle. Humidity is also normal at 50-65% I'm Running a 400 & a 600 mh apx 24" from canopy. I aerate my water in barrels for 24-48 hours before using. Soil ph was at about 5.7, I raised that up to 6.3 - 6.5 & that hasn't changed anything either. I've tried flushing. I am at my whit's end here guys. I have lost like four entire batches to this now. I feel like I've tried everything. Could it be some sort of disease that they keep passing to the new plants?? It's doesn't seem like it to me, but I don't know what to think anymore. I've asked every one I know, & I get every answer there is, one contradicting another. Please help 
