.

Similarly, how many Danios should be kept together?

Ideally you should have at least five or six danios, in a tank that holds at least 25 gallons (95 liters). A group of three fish in a smaller tank is acceptable, but can lead to stress or aggression. Never keep a zebra danio alone or in a tank smaller than 10 gallons (38L).

Also, how many Danios Can I put in a 5 gallon tank? I just got 3 zebra danios and added them to the tank. The tank's 5 gallons.

Also question is, how many Danios Can I put in a 10 gallon tank?

You can keep up to 10 Celestial Pearl Danios in a 10-gallon tank.

How long do Danios carry eggs?

They can carry their eggs for any amount of time really, and it all depends on when they are ready to lay eggs and if there is a male around to fertilize them. Technically speaking, if there are males around and they are developing eggs, they should not be carrying them for more than 4 days.