nute burn?

Hi, im a first time grower and im struggling with my 2 seedlings. We’re on day 9 and my bigger one, lime daiquiri, has been doing amazingly, my smaller banana blaze is struggling and although it sprouted first its growth rate has been much slower. Although I’ve read you shouldnt add nutrients...

Seeds were started in happy frog in 72 cell trays. Had stretching problems so I repotted into solo cups. Have been using plain water. Is this burn or a watering issue? Thanks in advance.

First time grow have 4 Super Lemon Haze plants in a 4x2 tent with a 1000w led. 5 weeks of veg now on week 6 of flower. around mid week 5 started getting burnt tips before that everything was green and beautiful. I flushed the 2 worst ones but the browning progressed. also seems like a cal/mag...

So a couple weeks ago I posted and I thought I figured it out ....my plant started getting burned tips and curling, kind of losing its nice green color. I checked the runoff ph and it was really acidic. I started flushing, I thought the plant was getting a little better so I cut off the tips...