What was it

Hey went to a local fish shop today, and they had two aquariums with two 'silver arowana' in them. but when i looked in the tank they looked nothing like the pictures of juvenile silver arowanas id seen. They were about 6-8 inches long they had totaly diffrent finage for a silver. they were blackie blue with a few yellow dots on the tail. the finage was the same shape as an asian arowans.
i couldnt take any pictures as i didnt have a camera, and was just wondering would anybody be able to ID it from the description.
if possible post a picture of whatit may be and how much it should cost.
thanks for any help.

Dont think thats it. It was a lot darker on top ( black ish )with a blue tint and little yellow circles on the tail. and its mouth looked a little diffrent . haha thanks tho.

urm no it looked like an asian arowana only black/blue.
and was cheap £ 39.99

Haha think ill buy it . then sell it for more money , i dont have a big enough tank to keep it at the moment.

ill post a pic if i can get some this week.