It's a 54l tank, dimensions of 60cm by 30cm by 30cm, with about 5cm of ecocomplete substrate, pic. The filter is an aquaone ocelarris 400, with a filtration capacity of 100l I think (if I understand it right).

Current inhabitants are a nerite snail, a bamboo shrimp, two Amano shrimp (called Takeshi and Amano :)) and about 5 RCS.

Possible options from what was in my LFS are the following :

Celestial pearl danios

Royal blue dwarf gourami (think these might be too big though)

Pygmy corys

Yellow dwarf cats (ornatus)

Cardinal or neon tetra

Red honey gouramis

Ottos

Chipmunk botia /dwarf chain loach (think they grow too big/need to be in too big of a shoal)

Leopard or panda corys

Dwarf neon blue rainbows (aqadvisor thinks these grow too big for my tank)

There's probably others I could have but those are the ones I noticed that I liked and might be okay.