Yellowing Of Leaves Magnesium Deficiency

Hello guys,

I acquired some plants that were in soil a little over a week ago. I transplanted them into 5 gallon pots with Happy Frog soil. They have been in the grow room for a about a week now but the leaves are yellowing. I have not fertilized yet as I assumed the soil would have the needed nutrients for awhile. This is my 4th grow but first in soil. I have researched and I believe it is a magnesium deficiency. What are your thoughts? Any help would be appreciated. Thanks!

had same problem with my GODS gift. transfered it from a gallon pot to a 5 gallon pot and it did the same thing. ive been using calimagic and its getting better.im a newbie too so dont take my word for it..my stem turned purple first then the yellowing of the leaves started...good luck

looks like ph related problems. make sure u have an accurate and reliable way of measuring your pH. imo most deficencies are caused by ph imbalance