When to transplant seedling

Now is the time to transplant into a bigger pot man , last thing you want is a root bound seedling that never reaches her full potential also you need to get her out of the clear cup as plant roots don’t like being exposed to light . It’s easy to transplant without causing damage , use your cup to push an indent into the new pot so it’s a perfect fit but stay away from clear pots . Not sure if you’ve got holes in the cup but you need to make sure your containers drain really well so it dries out a bit and those roots grow while looking for food . In saying that she looks nice n healthy , just needs a fresh start .

It's photo so I don't have that problem. Thanks you two!

i wait until the root system is substantial enough that the substrate won't just fall apart as i transplant. i like a little layer of perlite or similar at bottom of cup... then gently whisk it away as you transplant. this gives a bunch of root tips that will quickly spread out in right direction (down and out). I almost never see transplantn shock.. not even sure i've ever seen transplant shock before. the risk of shock vs the perils of properly watering a huge pot of substrate with a tiny plant... flip a coin, imho. whichever you prefer to handle for autos.