You guys have been so much help! Based on all your input as well as the input from members on N-R, I think I've come up with a final design. I ended up deciding against the split design because it added a 4th chamber which made everything tighter. Also, I'd prefer the return be off to one side so that its not what you see right smack in the middle of the tank. I talked to my friend on N-R who has a 30 gallon tank with 2 H. Erectus seahorses and after hearing how dirty the tank is going to get from feeding the seahorses, I think the fuge would actually get too dirty in the split design. The split design would skim uneaten mysis and masticated particles down into the fuge where they would settle and become a nitrate factory. I think having the fuge after the filtration will be fine because with as messy as the seahorses seem to be, there still should be nutrients left in the water after a pass through the filtration. Case in point, my main tank has an AC70 HOB that I modified to have a fuge section. The water pulled into the filter passes through the filter floss, chemipure, and purigen before going into the fuge section with the chaeto. That chaeto still seems to get plenty of nutrients and grows fine there. So anyways, here is what I'm thinking as my final design: I ended up reversing everything because I have better access to the left side of the tank (left side when facing the tank). I want the skimmer and media, which have to be accessed regularly to be on that side so that I can get to them more easily. Also, yes I realize the media rack isn't accessible unless you lift up the skimmer. The skimmer is going to be a nano skimmer that is small and light, so it will be easy to lift it up to grab the media rack and then clip the skimmer back in place.