Interesting build!
Not a fan of the blue/orange, rather let the color to corals but has long your happy that what matter!
You might have some trouble with the inflow, you might have organic waste floating on the surface with that arrangement. The vertical line are very long. I would do less longer, and more cut to let more surface water going in.
But test it, see what happen, maybe add something that float at the surface like..idk, flour? what ever, lol, just clean after
When I did mine:
I realize my problem of surface skim, I wish I made a bit wider entrance for the flow, I'm correcting it in the episode 7 with a tweak.