Hi Kanno.
Thats what happens with coco, as it needs to be moist all the time. Small pots (that sized plants has already filled the entire root space) and roots has absorbed every drop of the water from the medium and the plant starts to wilt. Thats not ditto at all. Damages the roots and bad damage enough can stunt the growth.
First of all you need to up-pot them into larger containers.
Also as I read the previous convo regarding coco, soil, coco-soil mix or neither… If its your first time grow and you would feel more comfortable using soil, as it is more forgiving and generally easier and/or easiest medium to take care of - you can up-pot those small coco rootballs into soil if you want to. That shouldn’t cause any problem as those pots were very small ones.
If you decide to use coco, then use coco. Don’t make coco based soil mixes. If you’re using soil, then you can mix up like 2/10 or 1/10 coco for the better aeration etc.
Premade soils pH are usually buffered somewhere between 6-6.7pH and if mixed into coco that causes pH problems. Soil mixes also contain the micronutrients that plant needs, but raw coco does not. Coco is an inert medium. And thats A, first why you have to feed them micros and second you have to keep an eye on the pH when using coco.
As the soil acts like a buffer and makes nutrients available for the roots - but when using coco, you’ve to do it yourself. Thats why you need to maintain stable 5.8-6.2pH
Perlite/Vermiculite can be mixed into coco for better aeration, holds moisture and warmth.