You're always going to get different opinions........this is mine.
I've been growing in coco for years with great success.
Coco is not soil and should not go through a wet/dry cycle or you will get salt build up.
I feed daily to run off starting around the 3rd day from sprout and twice a day in flower.
I never give plain water.........and I definitely never let the coco dry out.
If you want to learn the best way to grow in coco........may I suggest.......
www.cocoforcannabis.com.
But that's just me.
Good luck.