Oh wow they are beautiful!!! What type are they? The only Nerites we have here in the UK that are easily accesible are
Horned Zebra Nerites (CLITHON CORONA)
Zebra Nerites (Nerita natalensis)
Red Onion Nerite (NERITINA SEMICONIC)
They are all very nice too but they don't have awesome colours that pop like yours, thanks for the share.