Would a ph of 3 eat up an acrylic tank and the seals on a glass tank?
That's a cute little fish. Actually, I'm surprised it is the smallest found. 7.9mm isn't so tiny imo. It's about the size of 8 dimes stacked, as a dime is 1mm thick. So, that would make it about the size of a 2 month old swordtail fry I think?
Although they are found in ph 3 water, maybe they can live in higher ph, too?