It's a Paraneetroplus cf fenestratus 'Lago Catemaco' female or piebald fenestratus. Here's a pic of mine for comparison. It is as fully colored as it will get, if it's anything like mine. She is 3 years old and her color hasn't changed for at least 2 years. IME, males of this variant turn pretty much entirely white, but the females hold the piebald coloration.

female

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female

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