They're pretty but they're also a pain when it comes to disease. Good luck.
Also that is a ton of phosphate remover. Like carbon, you only need a little bit. I would suggest just filling that reactor about 1-2" anything else is just wasting it.
I noticed that as well. Looked like a ton of GFO. Same goes with your BP. If I can suggest anything, try to plumb your effluent of your biopellet reactor into your skimmer. I found a way to do it online and I have noticed a difference in skimmate color and production.
Great looking tank BTW !