The pot size depends on the size of the plant..I usually use 1 gallon pots for small-medium size plants.....2 for anything bigger.....on a 3x3 tray 16-20 pots....on a 4x4 tray 25-30 pots.......And as far as temp goes with the 1000 I would definitely try to cool with cool air from outside....if your region's temps are cool enough you might be able to get away with bringing in fresh cool air from outdoors and cooling your 1000 watt with cool air.......also running your lights at night works great for temp control........I cool all my lights with air from outside,so no air gets sucked out with that inline fan,I have another inline fan that has a carbon filter that exhaust to another room and in that room I have another fan with filter that exhaust outside,I have those 2 inline fans on timers so I can keep it at certain temp and humidity......and yeah that 1 bastard bub pheno is pretty awesome....I had another pheno that looked similar but was kinda bitter this 1 I kept is a lot sweeter with a hint on funk.