Reservoir outside the tent - from reading, with the bigger totes compared to the buckets, should I use 3" PVC returns to deter clogging? Then I'll have water flowing thru 3/4 inch tubing and pours into top of the grow chambers with an inline 400 Gallon per hour pump.No dude. There are NO air pumps. Period. You don't need a waterfall in the reservoir. In fact, you could put just one in the reservoir and pull from one of the buckets and it'd be enough. The only reason you do every site is because they'll be housing roots