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I don't think it is C. notopthalmus. Males have high dorsal spines on the front of the dorsal fin. There are many different populations of C. regani and probably several different species in this 'species'. I really can't say which species it is; not my area of interest. You might want to check with someone with more knowledge.
I've also seen the name C. dorsocellata applied to similar-looking fish. Dont know if that's considered a valid species name these days or a "junior synonym" (invalid name) for regani or notophthalmus.
Don't worry. They didn't go into the tank with the tetras. I just had the bag floating in there to take pictures. I thought female c. Regani had white around the black and not red. Although the color of this female is more orangish red. Do the separate dorsal spines come with age? They are around 2.5-3in now. They used to get along beautifully, but now the male has decided to claim the whole 75 gallon tank to himself and won't let the female out of the corner. She, so far, isn't getting beaten up and can eat, but if things don't get better in a couple of days I may have to put up a divider.
I had a similar looking pair in the early 90's (I called them dorsocellata then but never knew their true ID) -- the male had a white border surrounding a series of small smudgy-edged oval dorsal spots, and the female had a red border surrounding three sharp-edged round dorsal spots (one large, two small spots, kinda like L. dorsiger). Male's front spines got longer as he matured. Actually I don't even have proof they were the same species. They got along but never bred.
They look very similar to what I brought in last winter as C. cf. regani Iniridae. It may very well be a new species or what I've seen listed as C. iniridae but that whole regani complex of pikes is a jumbled mess right now. So unless you have collection location info on them I'd call them C. cf. regani.