I will post properly on this at some point but here is a photo of one of my pond creature photography set ups
It consists of a camera with macro lens (in this case Pentax K-5 and 100mm macro) with optional extension tubes, a small aquarium and a flash with diffusion off camera, in this case with a P-TTL cable.
With practice and adjusting of the flash position, followed by some pp to clean up the dust specks, you can end up with something like this.
If you have a go at this or have your own pond creature set up or photos, do post a link in the comments.
I am running a photography tuition workshop on how to photograph pond creatures see here