I like to point upwards so the thrust breaks the top of your water.
This promotes good gas exchange, helps to remove carbon dioxide and thus elevates PH.
I also point some at rocks, or dead areas to keep them free of crap.
With any pump the best luck I had was to try to adjust for as much random turbulence as possible, experimenting quite a bit. A hitch with aiming up can be salt creep, depending on depth in the tank.
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