My aquatic photography is very much in its infancy, but I have just had a go at the pictures below. I used a Nikon D40, ISO1600, various levels of under exposure and lighting was a desk lamp pointed at a black piece of card on the wall behind the tank. I wanted to create some distinctive rays of light beaming down, but wasn`t quite sure how to do it. please feel free to give your critique. Dave. P.S. This tank is just recovering from a bad case of Rhizoclonium and is feeling a bit sorry for itself at the moment.