Always worth a mooch round local and even not so local shops to see what large fish they have had knocking about in their tanks that have been dumped on them. Might pick up some nice freebies or knockdown price fishies!
I have a 1.5 - 2ft Clown Knife thats getting too big and a good sized Perruno Catfish that hates the deliteful wee kiddies kicking his tank. Im desperate for someone with a huge tank LOL. I had a customer almost cry because he paid £450 for a really big Clown Knife and i said £100 thinking he would complain it was too expensive.
I also have loads of things like Friedrichstalli Cichlids, Birchirs, Synos, Oscars, Large Severums, Leporinis(sp), Nicaragua Cichlids, Clarius and more to boot. Oh yeah, a beauty of a Silver Arrowana, big but not huge but he is growing unbelieveably quickly.
In fact, all our resevoir tanks are about the size of your tank! I have one crammed full of guppies too, got dumped on me...
Personally it would have to be