Hmm.. why don't you give us an idea of how you used to keep them? Perhaps you can share the following with us:
01. Tank size
02. Bioload
03. Species combination
04. Diet
05. water chemistry
06. Water management
07. Filtration
08. Decorations
Pop eyes are usually a sign of bad water as is dropsy (raised scales with bloated stomach).
Cheers,
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