diagnosis?

any ideas what could be wrong?

Need details on what you're doing and your setup.

Looks like it could be nute burn though, seems like it started
at the tips of the leaves and the outer portions working it's
way in.

i agree, need more info but looks like nute burn but could also be overwatering, when i started i watered way too much and it showed because the leaves turned browinish and started forming really weird, i just let it dry out completely and now i water once a week or twice when in flower.

i'm in soil, week 5 of flower, and i cant get my nute formula right. i figured out i wasnt adding any Mg so i added 1 tsp of epsom salt to 1 gal of water. i also discovered i wasnt adding any Ca, so i bought calplex at the local hydro store. im using miracle grow blooming formula as directed so it shouldnt be nute burn, and i only water when the soil is dry 3" below the surface, which is around once every 3-5 days.

anyone? i'm kinda freaking out. this is my first indoor grow and idk whats wrong