I have 4 plants in a 3x3x5 grow tent. Do you think it will be big enough. I am going to start lst once the smaller ones get a little bigger. Or should I go ahead and plan on making a bigger grow tent to fit them once they get bigger?
No, the 3x3 space is totally fine for your pot size! You even have space to move the plants around The only thing to look out for is the height, 5f. Flip them to flower when they are 2.5-3f tall.
And that bigger plant in the top left corner, you need to LST it, because it is already way taller than the others. Attach its branches to the pot, so you can lower the plant's size as close as possible to the 4 others.