help with new pot

Then find a container, that fits that space. Can be any size or shape? I've seen some great little plants trained at an early age to fill a rectangle container under led lighting.

3 plants in that area is pushing it, you will need to flower them while still quite small, probably 4 weeks veg max, maybe 5 at the very most.. 3 x 20cm round pots is probably going to be all that you can fit, make sure they are at least 25-10cm deep. 3 x 25cm square pots would be the go if you can find them, again at least 25-30cm deep. 18/6 is the best lighting schedule, they won't grow any much more at 19/5, - save your electricity bill, - plus they need adequate sleep! Hope this helps, Organoman.