Help with flow!!

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Wash

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I'm setting up an SPS tank with a built-in rear sump (AIO system).
The display area (excluding the rear sump) is 35 × 26 × 35 cm.

I'm currently running a DCS-1200 return pump at 40%, and a Jebao SLW-3 at 100% on H mode, positioned behind the rockwork. However, the flow still feels way too weak for SPS,
and I think I need to add another wavemaker.

The SLW-3 barely covers the back of the tank, and even that might need adjustment.

But the main issue is that the front side of my corals is getting almost no flow at all, and I really want to fix that.

Where would be the best position to place another wavemaker in this tank, and what model would you recommend? Any advice would be greatly appreciated!

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I'll attach some photos of the tank layout below in case it helps.
 
Move the powerhead up and forward towards the front more. Aim it towards the outlet of the return.
 

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