[daniella3d]

I see in your photos that the autofocus is probably not the problem but shake is what is causing the blur. Motion blur. Try using the camera with better light and it will produce sharper pics. The more magnification you use and the more motion blue you can get, so keep that in mind.

Try not using the flash either because that does not produce very good pics.

here are a few of mine. when taking pics of corals, shut down your pumps so that the flow will be not so strong and this way it will be easier to keep the camera steady. Using a higher F number will give you very slow shutter speed, so try to avoid that as well. I am very happy with the Olympus TG-2, it's a wonderfull camera for the aquarium.