aquarium photography

[figdish]

Being new to the interest of photography of aquariums and also new to my Canon EOS it would be nice if others who have been shooting their tanks for a while to help out with the settings needed to take nice shots of our tanks when lights are on and when they are off. I am also new to salt so kinda frustrating when I try to take pics of my tank when lights are out but I know there is action going on in tank. Don't want to upset everyone inside with flash. Even tried utube and not much help!