Shark's just attacked several fish! Help?!?

[brookie_uk]

I have had redfinned sharks in the past and they are very territoial. We had a cave for it and it would stay around that. if any fish came near it would just chase them off and then go back to it's cave.

 

[beercan]

This was most definitely not cleaning...

 

[beercan]

After it's little killing spree a while back it calmed down again.
I've bought 5 Rosy Barbs today, and as soon as they were in the tank he was at it again!!!
Trouble is, he didn't just stop at them, he's chasing everything smaller than himself. I've separated him for now...

Anyone in the UK want a shark for free?

EDIT:
Water stats:
PH 6.8
Nitrate: 10
Ammonia:0.25-0.50
Nitrite:0

 

[WILDER]

Try putting it in buy sell and swap further down the forum.

 

[beercan]

Will do!

 

[@ombomb]

Ammonia:0.25-0.50

Don't know if that is the actuall cause, but it certainly can't be helping the situation.

 

[beercan]

Will do a partial change in the morning as I'm off, then post new results.

 

[WILDER]

http/www.fishenthusiast.com/fishindex/rt...wsharkinfo.html

 

[@ombomb]

Mine is a grumpy ole' witch

 

[beercan]

Quite a few reports of attacks there...
Thanks.

 

[GSD]

these sharks are evil
take it from me ........take it back to the lfs.I have one it has killed nearly every fish i have in a matter of 3 weeks.Ive even concidered euthanising it.
im going to give mine to my uncle.If you deicde to keep it id only put it with bigger fish that itslef

 

[beercan]

It's currently in a breeding net pending my decision over its future.
It managed to kill a ruby before I caught it.