enough space?

Yo creo que estas bien. Luminaria? Recomiendo hacer lst y defoliacion para evitar posibles plagas y falta de luz a las ramas bajas. Puedes probar diferentes tipos de poda si te animas!

Yes you will run out of space. Switch to flowering

Lol. I have 15 plants in 1.5 m2.. you can make it work. And I'm juggling 7 fems and 8 autos. Doing a 36-12. If you want. When you flip. You can just run your light 24/7 and just swap plants out. Or run for 18hrs but make sure you give your fems, if they are only 12hrs. Lot of juggling. But if space is an issue. There's ways round like that. If they autos. Just make sure they all get 18hr under the light by switching them around. Don't worry about pests.. if there's pests in your grow room. They'll get in your tent. But, it you want, you can get a bug net and lay it over your plants. Good luck

Well here's the thing... what happens if we tell you you're going to run out of room? Are you going to pitch some plants?! 6 plants in a 1x1 was probably a bit much but you're stuck with the grow now and you'll need to do the best you can. If this were my grow, I'd be doing a lot of LST as well as defoliation - even to the point of trimming off some of the lower bud sites (lollipopping) because they'll never get enough light to make keeping them worth your while... this will let the plants put their energy into the uppermost buds and make them that much larger... You'll also need to make sure you've got plenty of air movement underneath to keep mold and fungus at bay... Good luck!

This question really requires a bit more information. If your growing indica dominant plants then you should be fine with some light defoliation and low stress training. If they are sativa dominant then you may not have enough space as they can stretch up to 3x there starting size. I think you'll be alright with the right training (bending into unused space) and a bit of defoliation (to allow light past the canopy).