Dean, do U mean cardinal tetras???A lot of people do frown on feeding live freshwater fish as there are many other types of prepared foods that are available to sustain your fish. Personally, on the odd occasion I used to feed my lionfish guppies, mollies and cardinals
Oh, yes you do...Southern Africa has BOTH Indian and Atlantic coastlines....im sure that you dont get Guppies in the Atlantic or idian ocean
They tolerate/thrive in worse/wider water conditions listed above....Distribution: Feral populations reported from the coastal reaches of Natal rivers from Durban southwards, as well as in the Kuruman Eye and Lake Otjikoto in Namibia (Ref. 7248).
Environment: benthopelagic; non-migratory; freshwater; brackish; pH range: 7.0 – 8.0; dH range: 9 - 19