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This is spot on.Imo, a 5.5 gallon is too small for both neon tetras and harlequin rasboras. Some fish that can comfortably be housed in a 5.5 gallon are betta, sparkling gourami, chili rasbora, dwarf rasbora, ruby tetra, endler's livebearers, clown killifish, ember tetra, celestial pearl danio, and pea puffer.
I want to say no.Thanks for all your replies and advice.
I have another question. For my 3 gallon tank that has my Betta and a snail, could I add some pygmy catfish, maybe 2-4?
I really wish I could get a bigger tank with lots of different kinds of fish in it. Oh well. Maybe some day.