Do you mean "Fun" as in: fun to watch them breeding or "Fun" as in: I don't have to do much of anything and look, I have fish fry?I find myself with a couple of empty tanks to fill and I was wondering what everyone's favourite fish is to breed. I'm currently breeding black bar endlers, very successfully.
Having bred a wide variety of fish myself, I'm not sure you can have both. It's usually one or the other. I think Angels spawning is quite an artistic and sometimes ballet looking expression. With the right food, the fry are not that hard to grow but the work involved can be much at times. And, I totally agree with Drago, you can't beat the dance of Anabantids spawning but fry rearing is not easy. But some of my biggest surprises have come with the Guppies. You just never know what you are going to get when you let a pair breed. That makes it fun as well.I mean fun as in fun to watch breed and grow without being a constant struggle