'gulp' I work in a lsf (dont string me up!!) and i have to say that we get at least 2 fish per week that have grown too large for peoples tanks, a couple days ago we had a bloke bring in 5 oscars because he wanted a change, which i really cant undersatnd.
last week we had 2 8" plecs, a large gourami, a nice big angel, and another fish (cant remember what) because they simply weren't wanted anymore.
although im not against passing on fish to people you know will house them well or growing fish for later sale, i am against taking them back to your lfs unless you know we can take them, firstly it takes up tank space which we may not have which could force us to put too many fish into a tank for god knows how long untill they sell (too many oscars untill space becomes available!),plus we cant always tell they are going to a good home even though we do try our best to make sure the new owners know how to care for them and have the means to but we cant always say they will care for them well
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Luckily the shop owner knows a woman with a positively hooooge tank (not sure how big but by his arm gestures id say about 5'x2'x2') and she is taking the plecs, angel and mystery fish away, but we are still stuck with the oscars and the gourami.
we can normally sell large passive fish easily but oscars and dempseys and the like are a bit trickier (resulting in the shop pet dempsey)