I have some ideas on o/f 's for a 180 I am building; the corner o/f setup from All-glass aquariums gave me the idea. I plan on drilling 2 bulkheads (one in each corner) about 22" high. The tank will be 24" high. The pvc plumbing will be behind the tank instead of in it. I am going to build baffles similiar to the All-glass ones with openings at about 3", 12", and the top. the baffle height will be roughly 23". I plan on using 1" pvc for the o/f, bringing both sides to a 1 1/4 tee with a ball valve to control flow if its too much prior to reaching the sump. I don't want to outrun my pump (I have not decided which to use yet, maybe a Flotec submersible). I am wondering if my sizes and measurements are adequate, please let me know what I can do to improve this set up. Thanks guys and gals, Tom