I buy all my fish online from www.msjinkzd.com
. However, her web site is full of good information on Nano Fish and she has a ton of species profiles. Just hover over the photo and click on, I believe, the envelope.
If you are getting shoaling fish like Pygmy or Habrosus Cories or Oto, you will need a minimum of six each. For Cories, I like 10. Oto will require supplement feeding with blanched vegetables because it's doubtful you'l have enough algae in a 10 gallon. You will also need to heavily plant. Nano do not do well with fake plants.
Believe it or not, with proper filtration you could have 30 plus Nano in a cycled 10 gallon. You could get a filter for the 10 gallon now and run it in a Betta tank for 3-6 weeks. That way you will have a cycled filter.
Get some Seachem Stability and add it when you add fish. Because I order online, I may add 20 fish at once to a tank. Using Stability has prevented any sort of mini-cycle or cycles to crash.
Some nice Nano/Micro fish I have are:
Dario Dario (if you're wiling to feed live food)
Celestial Pearl Danio
Male Chili Endlers Livebearers
Male Endlers Livebearers
African Dwarf Frogs (six maximum in a 10 gallon but no fewer than three)
Neons can really make a tank "pop." But, they can be a bit aggressive for the above fish; especially the Rasbora. If you get them, I would not get any Rasbora.
I just discovered the best food. It is from Fishguy_1955 on AquaBid and is called Breeder's Best Fry Flake. The Nanos LOVE it. I've even seen the Oto eating it. I also feed NLS Thera+A sinking pellets for small fish. Get the smallest amount of NLS pellets you can find.
They also like frozen shrimp and because I have the Dario I feed live, too.
"Breeder's Best Fry Flake Ingredients: Fish and krill meat. The primary protein source in Breeder's Best is high quality seafood protein supplemented with spirulina and fortified with vitamins and natural beta carotenes to promote natural immunity to disease and enhance color. Protein content is 48% with 10% fat and 3% fiber. It also provides an ongoing daily staple for adults of many smaller species such as endlers, guppies, cyprinids like celestial pearl danios, smaller tetras and of course bettas and many other anabantoids." ~ From Fishguy_1955