try macro mode if you have it.. if you can use a tripod,, use it.. although i rarley do.. very steady hands help. take alot of shots of the same thing,, the smae shot over and over and over,, your more likley to at least get one good one. if it helps turn off all pumps/powerheads if its something like a coral that moves in the curent alot. if your trying fish.. well that can be tricky when they are swiming, i still havent mastered that. read the owners manual that came with the cam. tons of good info in there.. just keep trying and before long you will be posting very clear nice pics