Tent 120cmx60cmx180cm

Very depending on your light power output. I just finished in Mars tent, you have I presume, my biggest auto ever, without scrog she took all tent. 240 g from 240 watts light she got for last 3 weeks of life, previously she had a lot less. We tried to do photos with scrip and 140 W light, kind of fulfill 70-80% of tent and got 130g, but it took ages, like 20 weeks or so. Now I try two autos in 20 liters, but same 140w light makes them develop so slow whatever tricks I use, and I know few ;) All grow should be though and mini preplanned , lights, strains, soil, feed and have sticky traps, wires and so on ;) I always went with bigger pots, better root system - bigger plant. I personally think for autos 30 liters air pots is a maximum, but most efficient. All the best !

I have a small (90cm x 50cm x 180cm) tent and two autoflower will fill the space. I think your slightly bigger tent will be limited to two plants. I would use 20 liter pots if doing two plants in that space. If you want you can use a larger pot and grow one larger photo plant, training it to fit the space available. I do not like using a SCROG net as it makes it difficult to access the plants. Instead I use ties from the branches to the top edge of the pot. That way the plant can be easily removed from the tent for inspection, pruning and training.

Its not about plant count. Just fill space with canopy. But sog is better with cuts. I tried seed and had one grow massive. Check my page i had to separate her.

Good luck with it I personally think its a small area and think you would struggle but if you don't think so why ask the questions in first place

Sorry, using 2 Sanlights evo 190w. And ventilation it’s not a problem I can get what it’s needed for that space.

Surely you won't fit more than 2 plants in the space also what lights and fans do you plan to use