- Dec 2, 2018
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Some of the pencilfish don't top 2", same with the hatchets and upside down cats. Shelldwellers don't break 2 inches either, for the most part, I've never seen anyone keep them in anything much bigger than that . there is a breeder who told me he keeps a group of transciptus in a 10g and they breed,when I asked him if I could keep a pair in a 10.
I've never seen an upside down cat of any type that small. Hatchets are extremely active, shoaling fish that come very close to the 2 inch mark.