stocking/strata questions for 20g long

[new2tanks]

hi,

i plan on keeping some cardinal or neon teras, a few corys and need soem suggestions for upper strata swimmers.
any colourful yet small sized fish suggestions would be helpful.

what about zebra danios, harlequin rasboras or some sort of guppies as they are so colourful. (i have no idea where these fish swim but would like smthg for all 3 levels of my 20 g long.

thanks. :dive2:

 

[RockabillyChick]

guppies are upper level swimmers. so are hatchet fish. if you look closely at fish, most that have their mouthes situated at the tops of their heads usually hang out at the top of the tank. those with their mouths on the underside are usually bottom feeders. however, i've found that most tetras will hang out in all levels of the aquarium, especially rather shallow ones like 20 longs.

 

[new2tanks]

so if i get all males or all females it should be okay?
coz nothing in my tank will probably feast on their population.