What's going on?

Hello I'm a new grower and wondering whats going on or if anything is?
This plant has had explosive growth since the main stem stopped thinning out but the bottom leave edges are turning slightly more yellow
I started nutes a week ago, when should I up nutes? I've used 1/8th of what it says
Light is 22in away at 25% goes by 25
Temp stays between 72 and 77 rh is 50-60
Is this anything to worry about or is it just the plant doing its thing?
Pics taken within a week of each otherScreenshot_20240801_015222_Gallery.jpgScreenshot_20240801_015314_Gallery.jpg
 
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