I'm thinking hatchet fish would be perfect, but I have one concern--they're jumpers.
They are, will find the holes in your old hood, and go carpet surfing in no time.
I really don't like glass tops though, I believe the cleaning is a hassle, and they cut down on the light that gets to my plants, so I just don't have any tanks set up this way. Also, hatchet fish are cool, I like mine, but If I didn't have my DIY canopy I wouldn't go out of my way to get a special top just to have hatchets. JMO.