Help me please

My plants leaf tips are turning black. I can't figure out why tho. I'm about to change the light cycle to 16/8. But I'm afraid to do so because of this problem. Can any one help me

From what I see in the pics looks to be nute burn.

never go to flower if your plant has issues. use the search option. i suggest "leaf tip burn...."

insidagain said:

From what I see in the pics looks to be nute burn.

Click to expand...

How can I fix this?

search, you can do it...