Since it's veg, lets dry em out first, but yeah that is what I see...super wet feet in to large pot is a mess.They all seem to be doing different things which makes a diagnosis more difficult.
Also, our rh shifts here pretty well indoors, sometimes its like 68 and two days later it's 20 or vice versa this 'in between' seasons time of year. This changes how much I water. I know you get the same at different times of the year.
I've never used megacrop. I use Botanicare mostly and some of the roots organic lines, and FF still in veg.
what is b52 ingredient and ratio?