DIY sump question

[attachment=0]image.jpg[/attachment]I bought a used 75g DIY sump someone already made. It is great tank for cheap holds water and colored baffles. I've made a smaller one before and still works great. I know I can change this one by cutting baffles out and reusing where I might want them. But I don't want to if I don't have to. This one has an angled baffle on one end. I'm not sure why if there is a purpose to it and which way the water should flow thur it. Can someone help if they know if there is a purpose for angled baffle? If this design would work and which way water should flow thur it?
 
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