Hi Steve, I would be very curious to see an image which hasn't been cleaned up for us to judge if it is all worth your effort. I bet that when you take an image like this with an underwater camera in the field that the water wouldn't be clean either.
Check out these galleries of one of Hollands best nature photographers
http://www.rubensmit.nl/en_gallery.php?galleryId=11
and of one of our Hollands best underwater photographers, who makes images like yours in natural habitat (check out the water beetle larvae eating a tadpole!)
http://www.kolvoortonderwaterfoto.nl...rwater_insects