mrvillicus
Fishaholic
No, do not even think about trying to flush live (or dead, for that matter) fish!
You could ask around your LFS (local fish shops) as some of them will take in unwanted fish; many have big display tanks for that purpose. Or advertise it as 'free to good home' on Gumtree/Freecycle/Craiglist/whatever's active in your area; or on Aquarist Classified.
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ill get around the shops tomorrow then!