i see your using tap water...... alot of people use it, but i recomend using R/O water. you can get it for 25 cents a gallon at those dispensors in front of the grocery store, it may help your plants to thrive. dont think thats the problem but just a pointer. tap water has alot of additives in it, as well as a high ppm. people let it sit out overnight to let the chlorine evaporate, but theres still other stuff in it.
oh also, might want to raise your R/H a bit too. im between 40-60%