Adding a chiller

[JohnsonDoe]

So I'm adding a chiller to a two 5 gallon bucket system. I'm going to add a chiller. I'm thinking I can get a third 5gallon bucket as the resivoir, and two submergeable water pumps. One to circulate water between the res and the chiller, second to circulate water between res and other two 5 gal buckets. I'm thinking if I have the pump that is circulating the res and other two buckets pump into the two buckets with plants at the top of the bucket, and if I run a return line out the bottom of the two buckets with plants to the res the 3 water buckets should remain about equal level? Or am I missing something or have any major flaws in this design.

 

[JohnsonDoe]

I guess I should add I planned on just leaving the pumps on. Thinking gravity and the circular current will work to keep the three same sized buckets the same water level. Also ever any issues of roots getting sucked up and damaged? The pumps will be in the res.