Last week I bought two swordtails, a male and a female. They get the run of the tank, while Snowball the betta gets an isolation tank and daily “free swim” with the filter off. I came to put Snowball away and thought the rank had been infiltrated by bugs! But no, it’s swordtail fry! I scooped out as many as I could, since the filter will pummel any left to its “mercy.”
Eek! I’m a new fish-mom!