Originally Posted by Okami
I know about guppies. What about Danios (glo fish), and Khuli Loaches? I want to keep my Betta's tank (when its bigger) with species found in a Blackwater pool
Well generally speaking 10g do not have the base footprint that is recommended for kuhli loaches, so no. Glofish is no also, they like to be in shoals of 8 - 10, each fish gets to about 2" long, so you'd pretty much fully stocked if you add eight Glofish in. Glofish are genitically mutated Zebra Danios, you could try 8 Glofish and one Betta and you're fully stocked (100%).
You can do it though, I would recommend lots of live plants to help with ammonia and a good filter (probably double your tank size, a filter for a 20g tank).