The limp xenia makes me think it's a water-quality (or O2) issue rather than soley a fish thing. I'd start with the 20% WC, add some more movement and re-asses in the AM. Are the fish showing any other signs of illness? (white spots/red patches etc)
Also check your temp! Sometimes the heaters fry. Have you put your hand in your tank at all? (I'm not suggesting you do if there is any live current lol, but if you have allready...)
please don't electrocute yourself lol
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