Guppies being aggressive?

[Sharkfin200]

So i have 2 male guppies and 2 platys (male and female) so i added the guppies first and then a few days later i bought 2 sunset platys, i added them to the tank and a few hours later the guppies started chasing the female platy, so a few days later I bought 2 females to calm the male guppies, it calmed one of the males for a few hours, the other male was just chasing the poor platy, then both guppies started chasing the male platy, the female one is staying in place at the bottom of the tank, I've also added a ghost shrimp and a cory catfish.

Should i separate them are more fish?!

 

[Demeter32]

Adding more fish is not the answer in this case. Generally fish will be aggressive for a few reasons, one being improper housing (such as too small a tank, not enough decor, not enough individuals in a school etc) and another being they are simply rival males/females. Male live-bearers, especially guppies, will try to mate with any other fish in the tank even if it is impossible for them to breed. Are they trying to mate with the platies or are they nipping at them?

How large is your tank? Can you perhaps provide a picture of the entire tank?

 

[Colin_T]

The male guppies are simply trying to breed with the female platies. Livebearers like mollies, guppies, swordtails and platies are best kept in separate sex tanks, eg males only or females only. This stops the males constantly harassing the females and stressing them out.