Looks promising. I would think that between the chaeto ball and the fuge section you should be fineI have a ~100 gallon sump (tank plus sump = 400 ~ gallons). I explained its complete layout in another post asking for advice a few days ago but nobody bothered to comment which, I have to admit, got me a little bummed out.
Here's the post link.
https://www.reef2reef.com/posts/5900595/