I maght was under watering before, i fill the pot with water to run off about 10 % now it takes about a day for it to dry (not fully but most) i will be adding extra cal mag as well with feeding from now the directions was 0.5 to 1.0 ml per 1 l of water, every time i water i feed them at the same time
Remember coco is not soil... don't let it dry out. Without perlite you will definitely feed less often. If I were in 3-5gal I would definitely be at 30-50% perlite but its not necessary just preference as it will give better growth rates.
So here is a kinda simple way to eliminate several issues throughout the grow.
Feed 5% of the media volume as nutrient solution each feeding. Of that you want 10-20% runoff. More is ok but wasteful less you may run into nutrient ratio or buildup issues later in the grow.
Eg. 3 gal is 11.3 litres 5% of that is rounding up about 600ml. Of that you want 10-20% runoff so you pour in 600ml and you want 60-120ml of runoff. This help keep PH, nutrient ratios and concentration in check.
This may seem like a lot but COCO is not soil it has a much lower CEC, much higher air holding capacity and much better drainage so nutrients and watering are different. You don't run into the "overwatering" issue very easily because of this. Since overwatering is not to much water but rather lack of oxygen. You need to feed each and every time because the coco won't hold nutrients like soil and you need to water with decent runoff to prevent a build up of available nutrients when using inorganic ferts. Of doing organic in coco then no runoff but leta not get into that.
Now how often you need to feed you base off the runoff. Assuming 3 gal pot... if your adding your 600ml and getting 300ml com out thats 50% runoff and you can lower the frequency of feeding but always keep the 5% feeding. If your getting no runoff then you know you need to feed your 600ml more often. You will notice when young it may be once a day and depending on pot and plant size may be several time a day when they get bigger.
In Coco I would stay between 400-800ppm. 400 when starting out and increasing slowly as they grow in size.
Hope that helps