Thes fish appear to be canabalistic
Abut 4 yrs ago I put six in a large hexagonal terrerium in a shady spot of my grow area
I was surprised after 3 years that there were at least 2 alive and at least 1 this year
They seem to have a habit of eating their youngThe only aereation they get is when I spray some water into the container
I think it would take a lot of fish poop to alter the ph