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Hi Andy,
Sounds like you have C. notophthalmus. While it is not
unusual to find C. regani females with just one dorsal fin spot, the majority of
them have two or more. With C. notophthalmus, most of them just have one
but occasionally you find a geographic variant with two spots. The spot is
also more circular and defined in C. notophthalmus while the spots in C. regani
can be abstract-looking. Another difference between the two is the color
around the black ocelli. C. regani females have white-ringed ocelli where
as C. notophthalmus have red around the dorsal spot. There are also
differences in the shape of the mouth and head of adults but these differences
are subtle and too hard to describe. The first 3-5 dorsal spines of C.
notophthalmus males are elongated and free-standing - similar to that of
Rams. Notos are slightly more aggressive and require very acidic water to
spawn. Think pH 4 to 4.5. There have only been a couple of aquarium
spawnings of notos. If you keep bachelor males of C. regani and
notophthalmus, the regani males will eventually be killed.
Hope that helps.
Vinny
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