I have mine on both ends aimed towards each other and the rock so I gt a haphazard water flow. Seems to do the trick. Again, once you get rock it will need water flow to avoid things piling up on it .
__________________ 180g- Mostly BIG fish and some coral. ~80g Nuvo- My coral tank with "happy fish"~ 90g- FOWLR Not the not happy type of fish~ 125g- Freshwater Malawi Cichlids ~10g- Nuvo- The refugees from the Ich of '18