cfl coco coir grow need some advice

Hi everyone. I'm growing bubba kush, purple kronic, skunk, jack herrer, and some dank mystery reggie. I'm growing them in coco coir under 11- 23w cfl's. I'm using GH flora duo nutrients and the temps stay a constant 80℉. I've grown in soil before but this is my first grow indoor and my first coco coir grow as well.

So with that said,
How often do I feed with nutrients? And at what strength. I'm growing in 1 gallon containers w/o drainage. I figure I just add 1/4 strength nutrient water when coco looks drier.? I was told to treat it like soil with a few little differences.
Any helpful advice welcome.

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