Hello all.
Now I don't know if anyone is going to believe me, but I have actually bred gollies. (I have been calling them muppies for a while, whoops!)
I have a virgin balloon belly molly, and about a month and a half ago I introduced two male cobra guppies into my tank. (The only other fish in the tank is a betta; there is also a ghost shrimp)
One of the guppies died the next day. (I should know better than to buy fish from petsmart. :/)
I saw the other guppy trying to mate with the molly (I thought unsuccessfully) many times over the next week. He unfortunately died shortly after.
Over the next few weeks I noticed my molly getting larger and quite exhausted. I thought she may have gotten something the guppies had.
One day I woke up and saw fry! I fished them out and put them into a fish bowl, trying to keep them from being eaten. I estimate there are about 25 of them.
After the fry were safe I looked it up online... and to my complete surprise, molly and guppies can breed!
So yes they can breed, I discovered completely by accident.
I have some pictures if anyone would like to see, but the fry were born on the 23rd so they're only a few days old as of now. They are growing so fast.
I obviously have no proof to back his up but, there's my story.