top 3 very deficult buti guess
1 asian arow (even tho u need to own a bank to get a great looking one)
2 Tinfoil Barb (cheap to buy, grow to a great size easy to keep and a shoal of 7 (9")or more can look fantastic)
3 Boesemani Rainbow ( great colours grow to a reasonable size, fairly tolarent of water parameters, great fish for the beginner, looking for somit different than guppies or platies)