Due to the character limit, the longer question is in the photo.

For a 120 x 120 tent with 4–6 plants in full bloom, you are going to be dealing with a lot of transpiration, especially during the "lights out" period. While the Hydrone 5 is a solid unit, the Hydrone 7 Closed Loop is definitely the better investment for a space that size. In growing, "overkill" is usually just another word for "peace of mind." Having the extra capacity of the 7 means the unit won't have to run at 100% constant capacity to maintain your targets, which usually makes it more efficient and quieter in the long run. Plus, the closed-loop integration with your AC Infinity setup will give you much tighter VPD control, which is crucial for avoiding mold in those dense flowering stages. If your budget allows for the 7, go for it—you'll be glad you have the extra power when your plants are peaking in late flower. Happy Growing Growmie🌱