powerhead strength?

[Callen]

Here's a pic. Sump directly below tank. Return pump is on right side with the clear tubing in a "swirl" upward as instructed by LFS. After it connects to bottom of tank it goes straight up then one 90 elbow to the " y" that the 2 black adjustable pipes / nozzles connect to ( keep forgetting the name of those)

 

[mr_X]

I don't know why they would suggest a swirl upward. There's no logical reason for it.
So, I guessed at the height to the DT, and using 3 feet as a measurement for that, I came up with 945gph after head loss, using this-
Head Loss