Help plz, this plant is 4 weeks in flowering and something is wrong

Is there something wrong with this plant? or is this normal for 4 weeks and 3 days into flowering?
I am using a 400w hps, 3 plants, soil grow. Used fox farm trio.

Add son calmag.they eat that shit up in flowering. Good luck

looks fine to me, nice work

Hey bro look like we have same problem I been following for 6weeks an 3days am trying to see if it looks like this at 6weeks

At what PPM are u feeding? The tips look to be showing a little burn. And whats the strain? FF can be tricky depending on the strain. Also what is ur PH at?

The strain is Juicy fruit, not sure exactly how I would measure PPM but I feed a little less than the "general feeding" says on the FF bottles. I also don't have a pH pen, is that a huge problem? I never thought it would be that big of a deal.