Are you doing a manual white balance? I was completely unhappy with my reefmaster mini until I started white balancing often under the water. After that, I am only halfway unhappy with it. Still a lot of pictures out of focus, even when particularly careful at being steady. The cozumel trip we just returned from I took about 350 pictures and can say that TWO of them turned out very well....about 90 or so are acceptable but with either slight blurring or poor color filtering (even with white balancing), and the other 260 were useless. I'm going to post some questions after we're all unpacked and settled in, to see if perhaps I was doing something wrong, but it's a pretty simple camera that I just can not get good pictures from. Perhaps that is the nature of underwater photography, and I will get to the bottom of that before our next trip...but thus far, not too impressed with the mini.
Another problem I noticed, which may well be causing the focus issues is when we would get down near 70 feet there would appear to be fogging inside the camera lens, in that when I looked at it, it would appear white. If we then went shallow...say 45 feet it would go away. There is no room inside the camera that I am aware of for desicant capsules, and following suggestions I would leave it open over night to insure it was dry inside but to no avail. There never seemed to be any water intrusion when I opened it up, but the next day the white lens would return. Again, open to the possiblility that I was doing something wrong....just no idea what.
Here is the best picture of the trip, one of two that turned out like this.
But most turned out like this, or worse.
Color issues, in my mind can be attributed to light or perhaps not frequent enough white balancing and maybe fixed with software manipulation but the focus issues are very frustrating. We had one very large turtle feeding where my partner got right down in the shot with him...and it blurred.

Even the acceptable shots are seldem in really good focus. It was very strange how one pic would be green, the next would not, then the following would be green again....in sea mode and manual balanced...taken 5 seconds apart and pics of the same thing.