what tropical fish or animals are easy to breed apart from things like guppies and mollies as they are 2 easy?

ive had guppies before and theres no effort required at all to breed them and this is coming from a 15 yr old! and i would like to breed something else.

ive heard cherry shrimps are easy to breed. what else is quite easy? btw i have a 2ftx18"x12" tank and 4ftx2ftx1ft tank