What's the problem? Is he still too skittish, or spooked by the flash light or something else.
When they were smaller, my reds didn't like to be photographed either (they got agressive and started fighting with each other, lol), but I just kept shooting pics night after night, for weeks on end, and many 100's of them, until they got used to it. Now they don't give a shiz when I shoot some pics: they just continue doing their piranha stuff like they always do...
Just keep trying, and perhaps it helps to shoot more pics and more frequently...
Good luck!