Add enough flow to keep the detritus suspended until it goes into the overflow. I would put the powerhead in the back corner, letting it hit the front glass.
This isnt enough room for an angelfish or a puffer unless they are dwarf also most tangs need more room too just saying you might have trouble with that. as for flow rate you want 30 times your tank volume an hour, and for powerheads put them on a wall near a corner and aim them at a large rock or other solid object in your tank.
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