When to water in coco/perlite?

You want Coco to always stay a bit damp . Instead of it fully drying out like soil. Don't let it dry out fully as this can increase your salts in the pots. Also fabric pots dry out quicker so you may need to water a little more than plastic pots. When I use fabrics I would water every other day in vedge and usually everyday in flower once they start needing more water . You'll know when they require more volume as there is less run off . I've now switched to plastic pots and can get away with feeding every other day , until the 5th week of flower . Never understood people feeding 3 times a day in Coco lol because I've never done that and never had any underwatering problems.