Check out TlkMDN's Paroon shark on Youtube. Still very active and about 4 feet. Sucks that your ID sharks have stunted, I got mine on the fourth of July and they're about one foot.
mAKES YOU WONDER IF SIZE HAS BEEN BRED OUT OF THEM SOMEHOW FOR THE uk MARKET, a year ago nearly every local aquatics store had them for sale and all advertised them as growing 6-12 inch. I've seen a few ID sharks returned too and none have been bigger than 12 inch. None were skittish at that size too.