i always take my pics at night. all lights off including my flash and leave just the aquariums lights on. this only works if you have flourecent lights. also if u want to take close up shots u have to make sure your macro is on. the macro usually looks like a little flower somewhere on your cam this will help with focusing on a certain object instead of always focusing on the backround. check out my tank pics in the gallery to get an idea of what it will turn out like.