Hey dude. Nice setup/strains. You've got big potential here
I have grown everything from 2 - 8 plants in a tent that size. Personally - I would do no more than 2 strains & try & keep each tank dedicated to one strain.
A PH pen would be the first thing I would recommend over your paper test kit. You'll be doing a lot of PH adjusting throughout the grow & it is far easier to dip a stick than mess on with litmus etc. You can be a lot more precise with one too. You can get one for £30 0n ebay.
Your intake fan also should be smaller than your extract so that you can achieve negative pressure (vital for smell control later on) so if it's no too late, then swap it for a 5" one.
Also, you're going to need to think of your water. It's best to stand tap water for 24 hours to let the chlorine evaporate - so some sort of water butt is a good idea. I'd say 100 litres for your setup. I also use another one which is solely for mixing up feeds. Makes life a lot easier, trust me.
Assuming you have your rockwool already?
Other than that you look set.
I'll happily help you along if you want. I'm on my 8th NFT grow at the moment
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