Why are my tips browning and curling ?

Last week I transplanted my plant into about a 50/30/20 of coco coir, FFOF and perlite. It had been showing signs of some kind of burn prior to transplant and has since recovered but now my tips are browning and curling. I gave them a 1/4 of recommended serving of big bloom before transplanting and haven’t gave anything since. What can be causing this ? Thanks in advance

You’re burning them with new new soil and feed on top of that. The new ocean forest is normally hot for young plants. Also I don’t recommend mixing soil and coco as they are 2 totally different mediums. I know they can be mixed and will work fine but you will need to feed sooner with less ocean forest. Don’t feed for a few weeks and just water when needed.