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Ryukins are pretty strong swimmer so I don't think they will have much trouble. You only need to worry about current with bubble eyes or some veils. <For reference, my return pump puts out 750 gph & the fish are fine with it. That is way stronger current that the Eheim.>
If you want, you can aim the return diagonally across the tank. This would create a calmer area at the near corner to the output. I do this so when I feed, the food don't all shoot across the tank & end up in the sump. This also gives an area with less current for sleep or rest. But for now, it seems like your fish are playing in the bubbles & enjoying themselves.
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80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.
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