Drill your return into the back wall and slap a loc-line onto it. This way you can adjust the return and play around with it by moving it above the water line and below the water line. Who knows, maybe you're the type of person who likes having salt water splash all over the place and salt creep all over your lights and the front of your glass? If you're not, then you can easily move the loc-line below the water surface :-)
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