Hi guy's, does anyone know where i can buy some activated charcoal for a diy filter ?

aquatics-warehousedotcodotyoukay will sort you out for reasonable price.
hth

The stuff i got looks like small pellets, which can be ground up as it is only charcoal thats had very very very hot air blown at it (i think)

U want it to be pellets, u will fuck it up if u powder it, it wont last as long or work as well.