Nah, it's not a coincidence. Some people around here (looking at T1) think they're experts when in reality, they no nothing about the Mekong river, which is 2700 miles long. I would find it hard to believe if there WEREN'T different collection point and different looking species of the same fish. Maybe it does have to do with water hardness, but all I know, is that these, when bigger, will look NOTHING, like and NTT. I'll bet anyone here. I plan on taking pictures of mine once a month to mark the growth.