Hi,
please don't take this the wrong way but three at a push will fill that size tent. I have a tent that size and four in 10l pots fill it. I also have a 180 x 180 x 80 tent and will be having six in there. Also you are growing soilless with canna coco so you need to be spot on with nutrients and always start low I would even say a quarter of what manufacturers say to prevent lock. You need a ph tester also and watch the ladies they would let you know if something is wrong straight away. Are you using an extractor fan with carbon filter?
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