Other fish with guppies it absolutely fine but some fish can get jealous. Well guppies like to show off their tail and sort of brag about it. So the other fish depending how aggressive it is, it may nibble of part of it’s tail. And usually it won’t grow back the same. Lot’s of people wonder if goldfish will eat their guppies. Gold fish could eat guppies if they grow enough. Like if you get a fancy gold fish and it grows big then possibly. The size that goldfish grow depends on how much room they have. Like if a goldfish lived in a 50 gallon tank then it would most likely grow much larger. But if it was in a little bowl it probably won’t grow as much. So most likely it won’t but anything can happen. So pretty much it depends on what size tank you have. Well anyway you could usually have guppies with other fish. Just so you know Goldfish can’t live with guppies because of their different water temperature requirements. Guppies can only live with other Tropical Freshwater Fish
Lots of people wonder if guppies can breed with other fish like gold fish or sword tails! Well the truth is they can’t. Guppies do not cross breed they can only breed with other guppies.