Kitten Fighting

[cats]

Please help,
I have got two kittens, one is a female which we have had for about a month and we have just got a 8week old male.
on the first and second day they hissed at each other e.t.c but nothing major, they just seemed to ignore each other.
Then they started to get on really well, they even chose to share their dinner with each other. and curling up on the top of the beds next to each other.
Tonight they have just started to fight, hissing, pinning each other down, running around the house after each other.
Should I separate them, or just leave them to fight it out?

Please five me your advice,
Thanks

[sarah00000]

Ooh dear, tricky one. Are they hurting each other? I have had trouble with introducing new cats before, but one has always been the timid one and ran away from the other, so no actual fighting.....

[kay]

I wouldnt separate them just keep a close eye on them. I have two cats and they quite often fight. Not sure if they are actually fighting or playing. They hiss, scream and role around on the floor. They have never injured each other apart from the flying fur.