Joanne,
Sometimes, belly slider can live to full maturity if food are always available(drop food right beside them) & there are no competition with the healthy ones.
"Will all belly sliders eventually die?"- All living things die, eventually. Correct me if I'm wrong, belly sliding are caused by external factor, like delayed wetting or insufficient oxygen etc. I had experienced raising a group of belly slider Austrolebias, collected their eggs & managed to raise healthy fry again.
"what do you eventually do with them?"- It took double the effort to raise them to produce eggs & is no fun seeing them lying flat on the ground most of the time. Some choose to cull them straight.
If you have your belly slider MAG living together with its healthy siblings, it will not be able to compete with them & die from hunger. That's the rule- Survival of the fittest!
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