So my 3 and half week old pla is showing signs of nutrient deficiancy. Yellowing at the tips of leaves, im thinking she needa magnesium. I'm using a 5in pot with mirical grow moisture control. I can't really upgrade the pot because it is in a PC case. So I was going to slowely start feeding it nutrients. I was looking at fox farms products big bloom and tiger bloom a superdrive. i can get 4oz of each on eba for 30$. Say if I water 4 times a week 3 out of the 4 i mix 1/2 teasoon of each nutrient. Will thes nutes save my grow. Are they going to provide magnesium? Thanks