All the advise here is good.But let me add one that works well for me...Don't be afraid to move in close....I take alot of my pics with the lens of the camera actually touching the tank glass...This way you can get in close without using the zoom.You can also steady the camera by putting your fingers on the tank.....The fish will be a bit spooky at first,but if you take 100's of shots,you will get some good ones...Also,by moving in close,the reflection from the flash will not be in the shot...So try some with the flash this way...Good luck...