As in micro Rasboras?
I have micro rasboras in a 5g and dwarf amber barbs in another, both very small peaceful school fish
As in micro Rasboras?
Snails ? sounds stupid but their actually fun to watch when their moving around and their not expensive . you could keep like 5 snails and some other small fish and maybe a Plecoptera but that might get to big for a 5 gal well not the albino but anyways snails are awesome.
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I wouldn't do neons or cardinals in a 5g. They like to be in larger groups and really need more swimming room. There are other schooling nano fish that would work in a 5g.
I personally wouldn't put any of the pencilfish in a 5g. Similar to tetras in that they very much appreciate swimming space.Heres a list of fish that could work: Trichopsis pumila, Neocaridina, Poecilia wingei, Poecilia reticulata, Colisia chuna, Betta splendens, Betta smaragdina, Neolamphrologus ocellatus, Danio margaritatus, Hyphessobrycon amandae, Corydoras pygmaeus, Badis Badis, Paracheirodon simulans, Cipangopaludina chinensis. Fish that would MAYBE work: Aphyosemion bitaeniatum, Nannostomus marginatus, Nannostomus beckfordi, Betta pi, Colisia lalia, Hyphessobrycon sp. "HY511", Paracheirodon, Caridina, Epiplatys annulatus.