IMHO you have nute burn. and possibly other issues going on here. I would suggest a flush with 3 times the volume of the container you have them in. I would use store bought water until you have your water issue worked out. Then... let them completely dry out.... Start back with nutes at 1/2 the recommended dose. Watch your plants to see how they react. Slowly build up the nutes giving them nutes every other time they need water. Watch them and make sure new growth is free from tip burn.
Just my two cents.