Aggressive guppy

[rebecca_lorene]

We inherited a freshwater tank when we bought our house 3 months ago. There were 3 tetras. A couple months ago we added some fish. We have 2 Mickey platys and a male gup (other died within a week). We have never had problems with aggression. Yesterday we bought 2 neon tetras, a sword lyretail and a yin yang guppy. Now the 1st guppy (he’s tiny) is being agressive to almost everyone. He chases and nips, gets them cornered. What are the chances this will pass? I wasn’t surprised when there was some aggression to the newbies, but why the platys that he’s been with? Petco employee seemed sure that all these should be fine together

 

[spacepops]

How big of a tank?

 

[rebecca_lorene]

We think it’s a 55 gallon tank. There’s plenty of room and places to hide

 

[spacepops]

I’m not extremely familiar with guppies . But I’m trying to cover the basics are you sure of the sex of all these fish?

Edit after reading again. There’s only one guppie?

 

[rebecca_lorene]

There’s a new yin yang gup that’s male......he’s not going after this one. He’s going after the other fish (new and established).....he’s never been like this

 

[spacepops]

Maybe just a rogue guppie? That sounds rediculous lol