some leaf issues... possibly potassium.. but idk!

im a noob and need some advice!

whatchu think... 2 different issues... 2 differnet strains

the first 2 pics are big bang the second 2 are church

ill give rep if someone can give me some legit advice.. dont bother with guesses PLEASE!!!!

thanks in advance!

Calcium and mag. def.

thanks.. I'll add some epsom salts for mqg and what should I use for cal?

n e one else goin for it?

I've heard of people taking calcium supplements for humans and crushing them up until they're soluble in water, shhhhhhhbang.

P.S. - Also, have you flushed recently? I had a problem like that, it was just built up salts on the roots that sufficated them from soaking up any nutes.

need info on water, nutes, ph, and what type of soil.

i think its a ph problem.

promix soil... i havent started adding castings yet, but next bunch of plants will have it..

but currently promix with fox farm trio and GH ph up and down. my water is from the faucet and is usually at 7.1. i add nutes, take it down to 6.5 every time.