@Cart3r249 
Welcome to AFN
. Well I think you are killing the roots and root microbes by letting the pot get too dry!
What you need to learn about watering will come with practice. Here are the basic rules: Never let the soil dry out. Soil and or coco can become hydrophobic if allowed to dry. This means it repels water. This in turn will create dry pockets in the soil and the roots and microbes will die there. If your soil - coco have accidentally dried out use a surfactant to help re-wet it. I like yucca powder. Don't let soil remain soggy by watering too much too often. Root rot, damping off, molds, fungus gnats and other problems start in soggy soil. When you do water
water the entire pot. How to learn when to water starts before you plant the seed. Fill your container with fresh soil/coco and weigh it (heft it) this is the lightest weight and consider it a dry pot. Now slowly water until the soil/coco will no longer absorb the water and run-off begins; weigh the pot (heft it) this is the maximum water, the wettest the pot can get. The difference between wettest and driest is the maximum water weight, for ease of explanation lets just say the water weighs 20 pounds. When the pot loses 10 pounds
(half of the water weight) it is time to water again. There is an art to watering.
Then we need to talk about Calcium.
OF is made with Dolomite Lime. This is a long term source for Calcium and Magnesium - more than enough for the entire grow. You should not need to add any Cal-mag. Then there is your Tap water what is the PPM?
Once you get a pot of
OF/
HF out of balance it is nearly impossible to get it back before an autoflower is done!
Understand feeding balanced nutrients:
The proper use of “salt” based fertilizer to grow Auto Flowering Cannabis. Salts: Natural and man made any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation. Learning how to use salt based...
www.autoflower.org
