1st Time Hydro

Ok this week went bad. I have been increasing my food for the girls and they seemed to like it. I would just pour it in the hole I made in the top of the tank. I don’t have a circulation pump and what I think is happening is too many nutrients or something isn’t mixing right. Anyways the leaves are curling and it’s getting brown spots and crunchy leaves. I am changing my tank, giving it straight water for a day and see if that helps. I am looking into adding a pump to move the water in the tank around also. If you see any way to improve let me know. I will keep you posted otherwise. Thanks