Is this too early to fim?

My plant is growing dense nodes, I think, so it's only like five inches tall. But it looks like it's working on node 5, right? Is this too early to fim? She's like 23 days from seed. Early on she had eayy too much light and fried a bit. Also got caught with fan blowing once.

Ive been advised that the earlier to fim is node 3 , my first experience actual grow i fimmed on 5th node and it went great