Looks very clean.....Wish I would have know what you were using before hand, cause I would have suggested a few things.....Instead of using the 90's I would have used sweeps.....Allows easier flow, but not a real big deal. I can't tell from the pics, but what are your return holes going back into the tank. It appears they are 1".....I might be wrong, but if they are 1" the flow will be cut down drastically. It's not the pump choice by any means, but mere restriction on bulkhead and plumbing size with 1", so you might be a tad disappointed with your end results if using 1". Even reducing it down even further with loc line is or should I say a waste. Mine will be coming out before the tank fires. Way to much restriction.
PH's IMHO are a must.....Seriously you'll never truly be able to accomplish all your flow needs with a CL system.....Being it might suffice while the tank is you, but as it grows in your returns and such are "fixed" with very little adjustment, so the addition of PH's will be needed to get complete movement. It also brings me back to my original thought of you will lose a bit due to straight up restriction, so couple that with growth over time it won't totally fit the bill.
1 suggestion or a couple suggestions I do have for you.....Take it for what it's worth, but secure your plumbing....Might seem simple at first thought, but it does cut down on some noise, but also provides support on your bulkheads and tank. Another area which makes me "squirm" is seeing those valves hanging off the tank.....I ran into this issue myself, and had to ease my mind with building some type of support for the plumbing....It appears fine, but think about those lines full of water and the weight pulling down. I know it's connected to other plumbing and eventually to a pump, but it's still weight pulling downward, now imagine just accidentally walking behind the tank you catch the plumbing with a good shot from your shoulder......At the right angle it could be fatal IMO just relying on glass/bulkheads.....At least with it secured or tied off the weight or load is supported......Just my .02 and maybe I over thought those things......