Dude or dudette, your plants look green and healthy, that’s all that matters! You can grow a plant in a solo cup start to finish. So pot size is just relative to your goals. Like someone said, do some research on LST. You want a table top look. If you’re just trying to get a successful first grow under your belt you’re doing great. You can always practice different techniques on your next grow! Good job, and my one and only piece of advice is to always check ph of water after mixing nutrients. Every time. No matter what.