I had a chat with the guy at my LFS who has given me some pretty good advice so far, he said it would be fine. As my 2nd tank was up and running thought I would give it a try see how they got on. Any problems and the big green net was ready to pounce.
Well pleased to say they seem to be fine, the Cory go about there business and the Shark goes about his. They are in the 10G together so space is fairly limited, but a couple of caves under the bog wood and from some stones give the shark some areas to go under, the corys seem content on gravel or sat on the log when they are 'resting' from ther snuffling (is that a verb?)