That's Hoplosternum littorale.
are they going feral in florida?
If the numbers get out of hand: this fish makes a great and exquise tasting chow.....you can cook or grill them on the BBQ and you gotta peel them like a cooked lobster.
tastes very good.
or if you're into Cajun cooking, well...should make a very nice add-on to a big bowl of Gumbo
If you don't like to eat them: it's a very nice mediumsized fish for your tank; it's very easygoing, it keeps the sand from clogging up (they're bulldozers

) and you can combine them with a long list of other fishes.
the only tanks in wich they fare less well are Rift-tanks (Malawi, Tanganyika).
yup, all those "Hoplo's" are social fish (Megalechis, Callichthys, Hioplosternum etc); and it's also true that breeding males are territorial, but only when breeding.
there are a few exceptions (adult Lepthoplosternum males tend to be territorial), but if you keep a group the behaviour is quite nice; they're very active and very docile.
handfeeding is quite easy.
if a pair is already enough; they do fine as pairs, given it's a male-female pair. a harem is also suitable (1 male, more females). you'll notice they stay close to each other most of the time.