even though your tank is cycled, adding large amounts of fish all at once will trigger an ammonia spike, and possibly kill or severely injure/sicken your fish.
Start small with just the danios (or glo fish, etc).
Then after a week of checking chemistry levels, add more.
Alot of people over stock their aquarium and everything seems fine, but realistically your individual fish will develop more personality if you limit the number of fish in your tank.
As said before 1 inch of fish per gallon is a good general idea, but your substrate ussually takes up the equivalent of a gallon, to two gallons of water, alot of betta keepers prefer their water line below the lip by about an inch or two inches - take awy another one to two gallons of water. You're left with about 6 inches of fish, and if your'e stretching that rule, a betta might equal as much as 1 inch of fish.
There is also a wonderful saying of "less is more." It applies to many things in life. Go back to that comment I made on personality. The fewer things you have in your small 10 gallon aquarium, the more interesting each individual element will seem.
On a personal note, I am a big fan of Harlequin Rasbora (Rasbora Heteromorpha). They are an inexpensive, beautifully colored fish. They should not be among schools fewer than 5, but they really are wonderful with 10. Their schooling mentality really becomes more pronounced, and they seem to act as one single organism.