Hi, i started off with about 80 molly fry from several mothers. They’re between 4 and 6 months old now. There’s only about 30 at this point and that number was pretty constant for a while but as soon as they hit about an inch long they start spiraling and some of them get popeye. I have no clue what’s going on. The other fish kept with them are fine and have been. This has been going on for about a month. I do biweekly water changes of about 40% because of the bioload. It’s also fry from both mothers doing this. It’s very gradual with only one dying a week but whatever this is has killed off about 15-20 fry now. Tried aquarium salt, parasite meds, fungal meds and bacterial meds. Parameters are perfect. Don’t know what’s going on.