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Sounds like swim bladder disease (SBD) that goldfish are prone to getting and the only thing I've heard of is frozen peas (defrosted, shelled) to resolve it (no actual cure in my research).
4 guppies (including dieing one)
3 corys
6 neons
2mollies
3 platys
1 dwarf gourmi
I don't do the cleaning but it's not cloudy, the other fish are healthy. Should I remove the dieing guppie, can it be spread?