Marble Hatchetfish perhaps; Silver Hatchets too big and too active. Do be aware that Hatchets are very nervous fish, and won't live long with anything boisterous. Hatchets are also extremely sensitive to water quality problems (don't add them for at least two months from setting the tank up and cycling it) and they also need water that isn't too hard (2-15 degrees dH, pH 6-7.5).
In 10 gallons, consider a school of Marble Hatchetfish, Lampeyes or Ricefish at the top, in the midwater something like a school of Golden Pencilfish, Dwarf Rasboras, Dwarf Danios or Ember Tetras, and at the bottom either a pair of Whiptails, a trio of Kuhli Loaches, a trio of Otocinclus or a school of Pygmy Corydoras. Dwarf African Frogs can work too.
There are countless options for 10-gallon tanks that work well if you're after specialist fish and don't mind setting the tank up for a single species. A small harem of Apistogramma, a colony of Tanganyikan Shell-Dwellers, a pair of Peacock Gudgeons, a group of Wrestling Halfbeaks, some Dwarf Puffers, perhaps even a pair or trio of non-annual Killifish if you can find them. With care, some of these could cohabit with tankmates, but these specialist fish will do better, and be more rewarding (show brighter colours or be breedable) if kept alone.
I happen to think 10-gallon tanks look best if allowed to "go wild", so I tend to stock with plants that I can largely leave alone (floating Indian Fern, Java moss and Anubias) and then add whatever shrimps, snails and small fish I'd like to keep and breed. After a while, the tank acquires almost a reef tank feel, with algae, plants, shrimps, snails and fish all multiplying away merrily without any input from me. Watching these tanks is really rewarding, and maintenance is minimal.
Cheers, Neale
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