I've got a casio exz50 with the 40m uw housing they make for it. It does very well in low light and is also quite fast. no strobe yet but I'm working on it. This shot is much reduced but was very fast - you can see the fish is quite agitated and there is tremedous force stored in his tail. A number of the shots of freshwater drums on my site were taken near sunset or late in the day - you can pretty much tell by the angle of the lighting. there is also a group of shots that were taken within half an hour of sunset on a dark, overcast day in the rain with very bad visibility - they are labeled - it's quite amazing anything showed up at all - I could barely see what I was shooting.
I expect they'll have a housing for the 750 before too long.
The link is in my profile if you want to check it out. I've only had a u/wcamera since June and this is the first photography I've done so be gentle
Haven't tried video yet.
Again - the photo below catches the fish in mid spook.
