I have 2 in my 20 gallon...my favorite fish. They ar 3 years old and named Heckle and Jeckle...lol. They are an awseome fish but do get on the larger side...going to move them to my 55 when it is set up.
My favorite of the armored catfishes. They get larger than corydoras (3-4") and are thus better suited to larger tanks with more boisterous tank mates. Keep 6 or more together to see them behave naturally. Less than this and they will remain healthy but tend to hide during the day and only come out to feed after lights out. Brochis have longer, swooping dorsal fins with 10 or more rays and almost no gap between the primary and secondary dorsal when compared to corydoras which have an upright dorsal with 5-8 rays and a larger gap between the primary and secondary dorsal. Often incorrectly sold as "Emerald Cory" in the pet trade. The true Emerald Cory is Corydoras aeneus, more commonly (and aptly) called the "Bronze Cory".
Long lasting, hardy little fish with lots of character. I've had mine for over four years, and they've been laying eggs after water changes. They survived moving three times, and a bout of ich (although, I'm not sure if they're even susceptible to it). They are sensitive to salt.