Also, the fuge doesn't really need a separate water pipe send... if you have a single water pipe send and put your fuge in the mix, this gives more flow to your refugium. You'd be sending clean water to the fuge as well because it's already been filtered by the bio-media. Because you've got your water flow split to two sides of your sump/fuge, that means the half that is going directly to your fuge is unfiltered... you could get all kinds of gunk through there and it could dirty up your fuge. However, your design is good if you want to control the flow to your fuge. In that case you wouldn't even need any baffles either... your right-side water pipe send could pump directly into the fuge... if it's slow enough.
Personally though, I'd have my sump/fuge look like this....
From left to right: Single Water Pipe Send -> Filter Pad/Bio-Media -> Skimmer -> Refugium -> Return
Keep in mind that having a fuge keeps microalgae down - the chaeto in there eats the same stuff other algae eat to live, basically making it uninhabitable for algae inside your display tank. The chaeto is a hog for this stuff and if you can feed your chaeto instead of feeding tons of little algae all over your display, that would be much better. Having a fuge/chaeto keeps your nitrate/phosphate down. It also makes a great breeding ground for little buggers like copepods... with a fuge, you'd probably be able to keep a Mandarin Goby.
Having said all that, it's good to give your refugium some more active flow, making it another stop your water makes before it goes back to the tank, instead of passive flow (giving the fuge it's own water pipe send and regulating it)
Whether active or passive, it's really up to you. It's been done both ways and it's worked both ways. I prefer more active flow because it makes your refugium work harder to keep your water/tank clean. Some people like more passive flow because it gives the fuge the ability to grow copepods faster without most of them getting caught in the current. I would check out DSB (deep sand bed) options too, although it's a bit of a hot topic here... some people hate them, some people love them. Ironically there aren't too many people in between.
Another thing to consider would be your lighting schedule. If you have your display lights on for 8 hours a day, it would be good to have your refugium lighting on for the other 16 hours a day. This is ideal because your chaeto isn't eating when your corals are. This isn't the only way to do it though... some people keep their refugium lights on 24/7. Some only have their fuge lit when the display is lit. I like the reverse-lighting schedule the best. Either that or the 24/7.
Have you thought about putting mangroves in your fuge?