New grower trying hyrdroponics dwc

I am using master blend 4-18-36 my 730ppm with pea gravel as a medium. Light approximately 27in from plant 4ft LED bulbs ( with red an blue) temp between 68-79f rh jumps between 35%-64%. I had 7 plants originally one male an a few died when i tried peat moss as a medium. But they all only have three leaves. And have stopped growing. I knew i had stressed them out cause i was just getting things set up an i moved things around rearranged room an changed lights. I finally have it set up I have other plants in the room like cucumbers peas sunflowers an ivy an a small herb garden. I would appreciate any advice or suggestions i can get. my plants are in the bigger Rubbermaid container. Waiting to hear something

It's a cool purple room, that's all I can say bro, can't see the plants really

You should try and get pics with the blurples turned off.

Also taking pics of the plants themselves , preferably close enough to see them, would be a big help.