Be careful with hatchetfish as they will jump out of your tank if you don't have it covered. Their body shape is that way because in the wild they will leap out of the water to avoid predators and they can jump a long ways. You can make them feel more secure by putting floating plants on top but without a cover I can guarantee they will end up on the floor. I used to have a large school of them and my tank is completely covered except for the back has notches about 2" for equipment to go into the tank and I still lost about 10 of them from jumping out of that little opening.
All matter is merely energy condensed to a slow vibration, we are all one consciousness experiencing itself subjectively, there is no such thing as death life is only a dream which is an imagination of ourselves. Bill Hicks
ua hua's 90 gal. high tech
ua hua's 5,000 gal. water garden