Welcome to a new run.
Just to get the bad news out of the way, the 4th strain, which will remain unnamed, did not sprout and I decided to just have 3 plants this time.
Now, for the first time, I’ll try using light mix soil, hopefully this will allow me to feed according to whatever deficiency I’m seeing without the worry of nute burn due the soil been too hot; which, I believe, has been a persistent issue I’ve been having.
@Fast_Buds, I made a mistake when uploading the photos; from week 4 onward I confused the strain with another one. This is now solved and makes sense, since the Crystal Meth is the only one that could have the purplish / black colored buds.