help my plants are dying...pleese

its,affecting the new growth.the new leaves are like dissinagrating, its like the life is being sucked right out,then all that is left is the veins of the leaf, my base of me plant is huge very healthy,,,...i dont know whats going on,and ith spreading. it looks like a bug is eating them. but i dont have any

In this community your gonna be needing pics , and some more info like whats your growing meduim ,lighting,and nutrient scheadule