I said any fish that is not common. Zebra pleco, Golden Nugget, Blue frontosa, anything from the syd. catfish family., many of the Lank tang cichlids..Too many to mention...
BUT...
Any fish that cant be found at your normal everyday LFS, Walmart, and Petco, petsmart, big als, you get the picture.
PS. probably any fish that serratooth doesnt own..He owns all the common ones..
In comment to wanting to impress. Different things impress different people. A person that is impressed when they look at a 16 inch long common goldfish may not bat an eye at zebra pleco. I know that I was far more impressed when I saw a large goldfish for the first time then when I saw a violet goby.
People are impressed when they see a giant Sturgeon or a huge arapaima,they sell arapaimas here but exclusively at farms,like what goldfish_freak said,different people different taste,i get impressed by large or huge,if there is an discoloured arapaima and a school of perfect cardinals,i would see the arapaima with eyes wide open and the cardinals with my back(didn't notice)
Im not refering to RARE as Only a few in the wild. Im talking about rare as in hard to get, expensive..... You will find those fish at a LFS rarely, expensive. They usually dont have many of them and may carry only 1 or 2 untill sold. Then wouldnt have another one for a few months.....hard to get.
RARE as in almost extinct or endangered. FISHKEEPERS shouldnt have them. They belong in a scientific institute or musuem where they can be bred and propogate the species.