I just used a dremel and drilled a hole on the top cover of my HOB filter, and ran the tubing directly next to the impeller. Changin was easy, I could just unscrew cap, or pull the tubing out and just shove it back in.
Now I use a powerhead for additional water flow and because the sound of the impellers chopping up the bubbles got annoying.
20L Planet Green Zone
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Filstar PIMP #111