Helo , i from Malaysian, some kind of Asian, i have 3 fire belly newt today, actually i have 2 fire belly before, one died and one more are escape to no where to be found again, now i got 2 big and fat newt and one more are small and i place it with 3 small bichir, i don,t know what is male and female, 2 of my 3 newt notably large and fat, what is that, it is healthy ?