This afternoon I found this small glass aquarium for sale for 8 dollars, a great deal in Manaus. It is 8 inches long 6 inches tall and 4 inches wide it came with a glass lid and styrofoam glooed to the bottom. I plan to take it on collecting expeditions to photograph fish without the added stress of taking them out of the water for pictures.
I discovered that if I put the glass in the aquarium I can partition it into two parts, one for plants or a good background, and the front, closest to the camera for the fish. This way the fish can’t hide in the plants but the background will look nicer.