I am probably going to run 1/2'' hose up to the island and from the island i will run weighted 3/8'' hose towards my floating dock. The depth is between 8-10 feet right in the middle on that side. On the other side i will put one diffuser its only about 5 feet.

Just an average guy trying to keep up two ponds.
Main pond 9000 sq ft with 1700 sq ft island 5.5ft avg depth
Second pond 2400 sq ft 4ft avg depth