well, as i live in Aus i can't help you with prices as our prices are much much higher as we cant import those lovely fish

I will mention that there is no recognised 'Dwarf Bristlenose' either as a species or as an aquarium fish. The only time i have heard of such fish is through genetic defects causing stunted growth.
If it was me i would be after a lot more info from the seller before i put up any of my hard earned coin
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