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hmm i have a regular bristlenose and it doesn't really look too much like those. the plecos on there have some funny shaped noses compared to mine (see my pics of 92 gallon post) :?
Gonna give you another thing to think about, they are all brothers and sister's. The breeder I got them from "mistakenly" got fry from albino and regular brown pair. The color morphs that you see are the result of that pairing. I'm quite impressed myself.
Those are still fairly young, aren't they?
They get longer bristles when older.. the males do at least. I think the coloration is a little different when older too. Genes also play a part in it.