you need a steady hand or use a suface to steady the camera in front of tank, what i do is use a suface and put on the self timer for 2.5 secs,then press top tick tick tick snap...sorted,i also have to take alot to get a few good shots without the flash...i found dropping the + - ev to -2 works well and also raising the iso to 800+...its fun to play...great shots with the flash anyhow...as said the second shots great