Should generally aim for about 6" between the siphon tube and the overflow, less will work but can be harder to tune and will take longer to recover on restart (this is why people use turned down elbows, to get the siphon tube lower). The second picture would work, but if you can get more height I would go for it
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~ 210 Gallon mixed reef ~ 37 Gallon Mixed Reef ~ Herbie drains for life!
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