On my desk is a 30" tank containing a solitary female Ramarizi dwarf cichlid, a thriving colony of guppies, which are, nominally at least, the property of my eldest stepdaughter, and since Sunday night, six knife (or knife-edge) livebearers, an unjustifiably obscure species from Central America, which I have to say that I had never heard of before bidding three quid for an immature trio.
It is interesting to watch them alongside the guppies because although superficially similar, they are much sleeker and much more predatory in appearance, and swim in a much more determined and forthright manner.
In the picture the two lighter-coloured fish are fully grown female guppies, and I think that the difference between the two species is very marked.
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