Join Date: Oct 2010
Location: Victoria, Australia
Here's a list of some of the smallest available fish in the trade. Most of these are fairly sensitive to poor water quality, and will need an established and decently planted set-up to thrive in.
However, I would be wary about the reaction of the male dwarf gourami towards much smaller fish. I know gouramis can be quite aggressive and territorial at times (particularly the males) and you have two in what is quite a smallish footprint.
The below fish can be somewhat more expensive than your common garden variety guppy and it would be a shame to have them eaten or attacked.
Celestial Pearl Danio
Scarlet Badis (not a schooling fish)
Sparkling gourami (not a schooling fish)
Green neon tetra
I would normally add lamp-eye killifish or clown panchax, but being mostly top level swimmers I worry these fish might be targeted by the gouramis as clown panchax in particular sometimes look like an insect darting across the surface.