I only have 2 tents with males at any one time (all males will be long gone by the time these romulans hit veg stage) the tents are quite far apart and I use a fair amount of negative air pressure vented away but also into a sponge wicking in water in a bucket in the exhaust side, to help mitigate as much pollen from escaping outside. I also stagger days I go in the tents with different clothes and showered etc…
These are the older stock, the ones they offer on their site now are being called Bx1.