OK, so here is my recirculating waterfarm finally. I based it on many of the tips & tricks I learned in this thread so I wanted to introduce it here first.

Since it is in a HydroHut mini I'm only using 4 buckets (only have a 400w anyway) and a 5th bucket with a Via Aqua 302 pump in it to recirculate back to the main reservoir. I did an illustration to show the flow.

I transplanted these Pure Power Plant from a bubbler I had going in another cabinet and they had mad roots already - I hope they make the transfer OK - this is my first attempt at hydro so it's all a gamble.