RL - In a new pond situation like yours and with the pond not full yet (mid-late August), you do not need bottom aeration until next spring. Get your "ducks", plans and equipment organized this fall / winter and install the system next spring in March or early April.

In small ponds such as yours, I always encourage pondmeisters to mount the diffuser on some sort of "sled" and just pull the diffuser with attached airline into its final resting place with a weather resistant rope from shore. Leave rope attached and when ever you need to clean or service the diffuser it can be easily pulled to shore with the rope. Boat delivery of the diffuser is an option but it is harder and somewhat more effort than the rope /sled method from shore. The only drawback to the rope-sled method is with a pond that is heavy with fish structure and dragging a diffuser and airline through the "clutter" can get all wrapped up in the fish structures.

aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management